BCC Hardware compares 3 Patriot Extreme Performance 2GB kits, the PC2-6400 Eased Latency and PC2-6400 Low Latency Kits
and the PC2-8500 Eased Latency Kit.  You get an idea from the review that while the Eased Latency kits are much cheaper, with a little overclocking they end up a better deal than their low latency cousins.

"As you can see from the results above, memory performance on today's Intel Core 2 Duo systems has more to do with

CPU speed than actual memory speed. When three different sets of Patriot memory are compared, all three produce

similar results. The kit that impressed me the most though was the "cheapy" DDR2-800 "Eased Latency" kit. This kit

ran at CAS3 at an amazing DDR2-879 when it comes clocked in at stock 5-5-5-12!"

Here are some more Memory articles from around the web:

  
Memory

• PNY XLR8 2GB 800MHz CL3 DDR2 Memory Kit Review

  @ Legit Reviews

• Patriot PDC22G9200ELK high-speed DDR2

  memory @ HEXUS

• OCZ Reaper HPC PC2-8500 2GB

  Memory Kit Review @ ThinkComputers

• Buffalo FireStix

  2x1GB PC2-9600 5-6-6 @ Overclockers Online

• Patriot 2x1GB

  PC2-9200 1150MHz Memory Kit Review @ Virtual-Hideout

• OCZ 4GB PC2-6400

  Platinum Edition @ Techgage

• Supertalent

  1600mhz DDR3 Memory @ DH

• Super Talent & TEAM: DDR3-1600 Is

  Here! @ AnandTech

• Crucial 2GB Ballistix Tracer PC2-8500

  memory kit @ Pro-Clockers