so thinkin of upgrading mobo/cpu. should i get an AMD 64bit? i was browsing around Monarch computers, and there is no selection of mobos with DDR2 for 64 bit mobo/cpu combos. for example, this asus one. what's the difference between dual channel and DDR2? and wats the diff between AMD64bit and AMD64bit (939 pin)? so i was thinkin of AMD64 or regular Pentium 4. comments? deals? thanks!!