I'll be buying a mew MB Pro, replacing my 2-1/2 year old Macbook 2.0Ghz this weekend. I can't decide which of the three to buy. I usually keep my laptops for about 2-1/2 to 3 years so I want something somewhat 'futureproof' (I know, it's kind of oxymoronic). Also, I tend to keep the laptop in desktop mode majority of the time (lid closed, external monitor). I need to be able to take it with me if/when needed. I feel that there won't be a significant performance upgrade over my 2.0 MB if I go with the 2.4Ghz. Is the 2.53 any different other than a slight Ghz in speed?...is the 2.8 noticeble in speed over the other two? Which ever I get I will be upgrading to 4GB of RAM and a 320 GB drive or better over the first year. Comments and suggestion welcome. Thanks.