My LifeBokk 4220 came with a measely 1 gig of RAM, and I'm ready to pry it open and fill it with with 4 gigs from Crucial (yes, I know Vista won't recognize all 4 gigs, that's OK). Crucial has two different 4 gig kits for the 4220. My question is, which one? 4GB kit (2GBx2) - $103.99 Part #: CT713448 DDR2 PC2-5300 CL=5 Unbuffered NON-ECC DDR2-667 1.8V 256Meg x 64 ....or... 4GB kit (2GBx2) - $109.99 Part #: CT768400 DDR2 PC2-6400 CL=6 Unbuffered NON-ECC DDR2-800 1.8V 256Meg x 64 The choice seems to be DDR2-667 versus DDR2-800. The price difference -- six dollars -- is obviously not really a factor. Is there any reason why I shouldn't get the DDR2-800 version ($109.99)? Thanks.