First off, please learn to type and use the shift key... iam isn't a word no a mistake on your behalf as you did it twice -.- 2nd, is AMD even up to 3GHz? AMD uses PR ratings so the Athlon 64 3000 is actually like 1.6GHz(or something like that)
It also depends on what type of processor you want. There's the AMD Athlon XP, Athlon 64, Sempron, Intel Celeron, Pentium(with a few different versions)