mhz.should

I have an AMD Athlon 2800+ on an MSI K8N Neo-V,with a 80 Gig SATA HDD.I have 256 MB of ram at 333 Mhz.I want to buy another 256 MB chip running at 333 Mhz.Should I go for Transcend/Hynix/Corsair/Kingston/Zion pls tell me the prices of all.........