15Bit Offline Upload & Sell: Off
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For lightroom its all about CPU speed - you buy the fastest CPU you can (and overclock it preferably). LR doesn't use the video card for acceleration and doesn't use much RAM at all as it very aggressively unloads images when you move to the next - i had to try very very hard to get it to use 3GB RAM on my machine, mostly it doesn't even hit 2GB. So for LR 8GB in the machine is enough.
Photoshop is less CPU limited for general editing, but can need speed if you use filters a lot. It will also make some use of hyperthreading, so an I7 will perform better than an I5. Photoshop will also use the video card to accelerate some things, so a low-mid range graphics card is worth getting. RAM is much more important for PS than for LR, as every time you generate another layer in the image you add to the RAM load. For most of us 16GB system RAM is enough, and is the sweet spot economically too. If you are doing big multi-shot panos or you just really love layers, then you might want to move up to 32GB.
According to my testing LR seems to benefit little from SSD's (some people do report otherwise though). Photoshop will only benefit from a fast disk subsystem if it runs out of RAM, in which case an SSD makes a huge difference. Installing your operating system and applications on an SSD does make a big difference to general system usage though (it just feels snappier and more immediate to use), so is highly recommended.
If buying from a vendor i would recommend specs of the sort:
Intel I5 or I7 at 3.2-3.5Ghz
16GB RAM
NVidia GTX650 or AMD Radeon 7770
128GB SSD for operating system and applications
2TB (or larger) Hard disk for data
If you can build yourself then get either an i5-4670K or i7-4770K and overclock it
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