First of all, this is the system I'm considering:
Case: Silverstone TJ10B
MoBo: Intel SmackOver X58 (Nehelem) MoBo (BOXDX58SO)
CPU: Intel i7 940, Nehalem
Cooler: Thermalright True Black 120 Heat Pipe Black Nickel Plated Heat Sink
Ram: 6GB (3x2GB) CorsairXMS3, DDR3 PC3-10666 (1333) CAS 9-9-9-24
GPU: 512MB Sapphire HD 4870, 3600MHz GDDR5, 750MHz GPU, 800 Cores
PSU: 850W Coolermaster Real Power M850 Modular PSU
Sys HDD: 300 GB Western Digital WD3000GLFS VelociRaptor, 10000 rpm, 16MB Cache
Stor HDD: 750 GB Western Digital WD7501AALS Caviar Black, 7200 rpm, 32MB Cache
Sound: Creative Sound Blaster X-Fi Xtreme Gamer Sound Card 7.1Ch OEM
DVDRW: Pioneer DVR-216DBK 20x DVD±R, 12x DVD±DL, DVD+RW x8/-RW x6, SATA, Black
Additons: Silverstone All In One Card reader & USB 2.0, 120mm AK-183-L2B Akasa Amber Case Fan x5, ZM-MFC1-PLUS-BLACK - Zalman ZM-MFC1 Plus Black Multi Fan Controller, AcoustiPack ULTIMATE Multi-Layered Material Kit
For the most part it's a configured pre-built system, but it also has a couple little modifications I'm asking for, and it'll cost just over £2k. Any comments or suggestions are welcome.
Now the crux of the matter. This is the system I currently have, just listing the important bits:
CPU: Athlon64 X2 3800 939
MoBo: EPoX EP-9NPA+ Ultra
GPU: Leadtek GeForce 7800GT 256MB
RAM: 2GB (4x512kb) PC3200
I put it together myself coming up to 3 years ago now, and I've noticed bit of slow down over the past few months. I regularly defrag and run mal/spyware scans, etc, but it doesn't seem to help, especially when playing games. I play WoW and raid a lot, and since the expansion in particular I've noticed things take longer to load, characters take longer to appear, I have to turn down graphic options to get even around 15fps in some areas, when switching targets in raids the game seems to freeze up for a second or two and things like that. I guess the bottom line is really are such performance issues to be expected in WoW with my current system, in which case I'll probably spring for the new system, or is there something else I can do to help?