1st of all, is the 256 MB version of the x1600 worth it?? (more memory isn't always better, do i smell a salespitch?) next. 17" imac or 20" imac. obviously bigger is better here but does anyone really care about 3 inches more of Screen?! Thoughts?? and processor speed. 1.83Ghz or 2.0Ghz, again more is better here. BUT! is the 160 or so Mhz a BIG difference? i doubt it.. Thoughts?? IS THE 300 TO 400 (possibly even 500 after tax and full customization) DOLLAR PRICE GAP BETWEEN THE MODELS WORTH THESE TINY DIFFERENCES FOR HL2 OR COMPUTING IN GENERAL?? ALL I NEED IS A GOOD CONIFIG TO RUN COUNTERSTRIKE SOURCE. Post your thoughts, on these configs for CS and general usage. any thoughts on my perspective?