Right, so because the other thread drowned away several pages, I'll create a new thread. Unfortunately, since I didn't get any final answer in the other thread, nor want to order before I was sure what to buy, the sale expired before I was able to order anything.
To sum up, I wanted to get a new monitor, as the one I currently use is closing in on 11 years of use (still works like a charm, but I can't play WoW on a higher resolution than 1280x1024), and at the same time I was recommended to get a new GPU, because the one I have is bottlenecking the rest of my system. I'm mainly using the computer to play WoW, but I might get into frapsing in the future.
Here's my current build:
CPU: Intel Core i5 Quad Processor i5-750 (Quad Core, 2.66Ghz, Socket 1156, 8MB, 95W, Boxed w)
Motherboard: MSI H55M-E33, H55, Socket-1156, DDR3 (DDRIII, mATX, 1xPCI-Ex(2.0)x16, GbLan, OC Genie, D)
Memory: Kingston ValueR. DDR3 1333MHz 4GB, CL9 (Kit w/two matched ValueRAM 2GB DDR3)
Storage: Western Digital Caviar SE16 500GB SATA2 (16MB 7200RPM)
Video Card: PowerColor Radeon HD 5670 512MB GDDR5 (PCI-Express 2.0, DVI-I, HDMI)
Case: Cooler Master Elite 310 Black/Orange (Fan: 1x 120mm Behind, ATX, mATX, 2x USB, 1x Audio, )
Power Supply: Corsair VX 550W PSU (ATX 12V V2.2, 80 Plus, Standard, 1x 6pin, 1x 6+2-p)
Optical Drive: Sony NEC Optiarc DVD±RW burner AD-7240S (DVDRW 24x, DL, RAM, SATA, Bulk, Black)
Operating System: MS COA Label Windows Home Premium 7 (Nordic, 32/64 bit)
I ended up looking at this monitor and this GPU (as it seemed to have quite a bit of overclocking potential). Now, even though the sale is over, the monitor's price has been reduced by 100 NOK, but I have found both the monitor and the GPU on another site on which they're around as cheap as they were on Komplett during the sale.
However, I noticed that the monitor only supports VGA, while the GPU (like most other GPUs for that price and up) only supports DVI. So one question that I have is if a converter (or a cable with VGA in one end and a DVI in the other) will take a toll on the speed. I can of course switch to another monitor if that's more feasible.
Another thing that might be worth bringing to attention, is that a 7870 is up for 100 NOK less than the 7850 of the same brand, for some reason.
Lastly, here is a Norwegian comparison site in case anyone has other suggestions -- hopefully the pictures will suffice in knowing which section is which. Also, my budget is around 2800 NOK ($500~).