TP, if you think that spec is going to be pricey, then you're probably right. I must admit I have little experience with laptops (apart from fixing & upgrading a few), but I believe Dell are a pretty expensive supplier. You'll probably be paying over the odds to them. On the other hand, as far as I remember, they do offer some peace of mind as far as warranties and fault-fixing go, so maybe that's worth some extra cash.
Is it really necessary to upgrade to 32GB RAM? Unless you're doing complex 3D design & modelling using extra-large textures, or some other really high-power application, you could save some money by sticking with 16GB. Since I upgraded my desktop PC to 16GB a couple of years ago, I haven't had any issues which could be attributed to lack of RAM. I sometimes leave Steam updating in the background, and have my browser open at the GPLRank webpage while I'm playing GPL, and the PC handles it all quite smoothly.
Is an i7 processor really necessary? For desktops, it can add between £80-£100 to the cost compared to an i5, and most software doesn't really take advantage of the chip. I have an older-generation i5 processor in my PC (i5 4570 @ 3.2GHz) and it handles everything I can throw at it. There are newer generation i5's available which are quite a bit more efficient and faster, so I think you might be able to save some money by going for a decent i5 instead of an i7. (Unfortunately I can't upgrade my processor as Intel changed their socket type from 1150 to 1151 a while ago. *SIGH*
The disk RPM only applies to the HDD, not the SSD (was that a typo?
) and isn't always the best indicator of a good, fast drive. A 5400 drive is ok, but the most important thing is the stated transfer rate of the drive. My PC has a 2TB, 7200RPM HDD connected via SATA-3, which gives a stated maximum transfer rate of 6GB/s. See if you can find out the connection type and speed to give you an accurate assessment of the laptop HDD. Speeds may have increased even more recently, I haven't checked the latest hardware specs, so SATA-3 6GB/s may be out of date..
Upgrading the SSD from 256GB to 500GB might be possible, and might be quite beneficial. The main point in having an SSD is to get Windows starting up faster, and 256GB will allow the OS to be installed on the SSD (with the Windows swap file also), possibly
with a little space left over for a few games. But if you can have a little extra fast storage space, you might find it very useful.
I've never got around to moving my GPL installation onto my SSD as I have so much stuff installed it would be a bit of a chore. I'm sure the SSD would allow Targa and Spa etc to load quite a bit more quickly. But generally, I don't think SSD speed would make all that much difference to the way I experience GPL.
However, one game where I noticed a big
improvement was Skyrim. I have a number of mods installed for the game which increase the detail level of textures and 3D objects and terrain. The game constantly loads new data as I move around in the game world, and when I moved Skyrim from my HDD to my SSD, the gameplay became so
much smoother and better.
So if you have anything which relies on accessing data while it's running, or something which takes some time to load when you start it up, then having more SSD storage space to install it on there would be useful.
The GTX1060 6GB sounds impressive. I would love to see how they pack the circuitry for that into a laptop! That was the card I was hoping to get early last year to replace my ageing GTX650, but I found the prices too high. I eventually plumped for a GTX1050Ti 4GB, and I'm very happy with it. Again, that could possibly be a way for you to save some money, but graphics is the area where PCs/laptops seem to get outdated most quickly, so if you can afford the GTX1060 then go for it.
The only other thing I would query is the screen size. Your details say 15.6" - that sounds a little small to me. Would it be worth getting a bigger screen to improve your experience, especially with gaming? But then again, if you don't use a desktop, maybe you're used to a smaller screen. And increasing it would obviously have some cost implications. So maybe that's a compromise which has to be made.
Hopefully you will get some feedback from others who have had more experience with laptops, and with Dell. But I hope my comments might help. Good luck finding your ideal machine, TP!