Re: Is it worth it?
A simple answer is: depends on what graphics card you use, what games you play, and how long you plan to use it, what settings you usually play at. What is your current video card? What games do you usually play? Do you always turn FSAA on? How long do you intend to keep the card? 1 year? 2 years?
As for me I play a lot of Crysis, the most demanding game, so I had to get 2x GTX 295 replacing my over-2-year-old 8800 GTX I've been using since November 2006. The gap b/w these cards are humongous as anyone would say: how can you compare 1 GPU to 4 GPUs? However, if you're just an occasional FPS gamer, or play a lot of RTS games like RA3 or alike, a single 280/285 should do the job. I highly doubt a 285 would have rough time running CoD5, WoW, or L4D in decent settings. Developers are well-aware that to ensure success, the game must appeal to a broad range of computers, not just to people with quad and 2-way SLI setups.
Of course, 2 295 to play Starcraft 2 would be an overkill as I recall rumored recommended specs to play SC2 isn't that high. Also keep in mind that there will be new cards in about 5-6 months time and GTX 300 series coming out at the end of the year. So it really boils down to all those factors I mentioned above. If you can wait 6 or 12 months, you can get the latest models outperforming the current 295.
J1 \ J2
CPU: i7 940 @ 3.34GHz \ QX6700 @ 2.66GHz
Mobo: EVGA x58 SLI E758 \ Asus nforce 590i
RAM: OCZ DDR3 1600MHz 12GB @ 9-9-9-24 \ Micron DDR2 667MHz 4GB @ 5-5-5-15
HDD: 4TB WD C (2x Black, 1x Green) \ 4.5TB WD C (2x Black, 2x Green)
GPU: EVGA Geforce GTX 295 quad SLI \ BFG Geforce 8800 GTX
M & K: L NEW! G19 & G500 \ G15 & G5
SC: Creative X-Fi Fatal1ty Pro
Headset: NEW! ATH-AD900 \ SS 5H V2 USB
PSU: Tt Toughpower 1200w \ CM RPP 750w
Case: A1200 \ Dell XPS 710
LCD: Dell U2410 H-IPS + LG L246WP-BN 24" P-MVA \ LG W2243T-PF 21.5" TN 1080p
OS: Genuine W7 x64 Pro \ "
Cooler: Megahalems + 2x Scythe S-F push/pull E/W \ TRUE 120 + 1x tr push