Wanting to upgrade some.

Ok, here is what I am running now.

2x LITE-ON 20X DVD±R DVD Burner included extra White bezel, with 12X DVD-RAM Write Black IDE Model DH-20A3P-08 - Retail

EVGA 512-P3-N841-A3 GeForce 8800GTS (G92) 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Retail

GIGABYTE GA-P35-DS3R LGA 775 Intel P35 ATX Intel Motherboard - Retail

Western Digital Caviar Blue WD5000AAKS 500GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive - OEM
Item #: N82E16822136073

Kingston 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 667 (PC2 5300) Dual Channel Kit Desktop Memory Model KVR667D2N5K2/4G - Retail

Intel Core 2 Quad Q6600 Kentsfield 2.4GHz LGA 775 Quad-Core Processor Model BX80562Q6600 - Retail

CORSAIR CMPSU-550VX 550W ATX12V V2.2 SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Compatible with Core i7 Power ... - Retail

Antec Nine Hundred Black Steel ATX Mid Tower Computer Case - Retail

I am running Win XP Pro 32 bit.

While I am getting ok performance, just like most of you, I am looking for more. I use my system mainly for gaming and I enjoy playing LOTRO right now and the graphics stutter a bit when I am in a large group of people. I also enjoy playing games like Crysis, Gears of War, Oblivion, Fallout 3 etc etc.

What would give me the most bang for my buck and be compatible with what I have? I was thinking a new video card maybe something SLI, but that would need a new PSU I think. Is that RAM good enough or should I step up to DDR3 if I can? Any help is appreciated!

The large group of people making you stutter is a CPU bottleneck as there is more for it to keep track of and that is a fairly slow quad, consider either upgrading it or OCing it. There is no good reason to upgrade to DDR3 ram with an existing build, there is minimal performance differences.

I play at 1680 x 1050. The monitor's native resolution. I actually looked today and I do not even think I can run an SLI setup since my board only has one PCIE card slot. I tried overclocking it via Easytune 5 today and had to pull my CMOS battery and reset it to get it to boot again.

I think I am gonna study up a bit more and see if I can get the right overclocking done via the BIOS. Thanks for all of the input. And yeah I think I am gonna look at a GTX275 for now.