Just a reference for you from my test result:
Among many RAMs I have, the Samsung PC2700 I am using (ATP designed PCB; my samsung original order hasnt arrived yet) performs the best and did reach 215 mhz with setting at "normal" and 201 Mhz with setting at 2-2-2-5-1 (turbo plus 1T on time command).
I am using 512MB and would suggest you to go with single stick 512MB instead of two 256 MB sticks. I just got another 512MB Samsung yesterday before I go home from the same company ATP (they are just right next to my office; their main business is in ECC high end RAM for server). I am quite happy with their own designed PCB for PC2700 with Samsung chip.
The safer bet for you is to buy Samsung origianal (Samsung's own designed PCB) from place like Newegg
http://www.newegg.com/app/ViewProduct.asp?submit=manufactory&catalog=147&manufactory=1077&DEPA=1. The other key thing to take full advantage of PC2700 is to unlock your CPU so you can go higher FSB. Samsung chip is super for FSB at any RAM time setting.
Following is a brief summary on other RAMs I have tried. Hope it will help you on decision making.
Epox 8k3a+ (rev. 1.2)
AMD 2000XP
Corsair XMS3000 -- 199 @ 2-2-2-5-1
Kingmax PC2700 -- 180 @ 2-2-2-5-1
TwinMos PC2700 (Windbond chip stamping A version) -- fail @ 2-2-2-5-1
Samsung PC2700 (ATP designed; still waiting for Samsung original) -- 201 @ 2-2-2-5-1
CoolerMaster ATC210 modified with 8 fans
Thermalright AX-7 with Delta 80CFM
PC mods rheobus 4 channel fan controller (17W per channel)
digiDoc5 for temp hardware monitoring
2 x IBM ATA 100 HD
Toshiba 16x DVD and Pelxter CD-ROM
MV99