In trying to select 2GB's of RAM for my 2.5 G5, I noticed I could save a few dollars by purchasing 4 sticks of 512MB versus 2 of the 1GB. Is there any noticable difference in having more chips? I mean, if I've got 8 slots and add 4 to my existing 2, I'll still be left with 2 for the future. I guess I'd prefer to just go with the two 1GB sticks to save the other slots, just not sure if this might affect the performance of the machine at all. Also, I know http://www.crucial.com has been plugged here a million+ times for Mac memory upgrades, but has anyone dealt with http://www.18004memory or http://macsales.com (OWC)? They seem to offer some great prices on 2GB kits (1GBx2), each right around $250. Your thoughts and opinions are welcomed! Thanks!