I need some advice from someone smarter than I am in these matters for a purchasing decision. I want to get one of the new 15in MBPs and I want to dual run OSX and WIN7. Which configuration could I use that would make the process smooth (as in run smooth) but avoid wasting money on features I wouldn't need. I was thinking of the mid-range 15inch with 2.53ghz and 4gb of ram. Is that enough or would WIN7 run terribly in such a set-up? Could I get away with the 2.4ghz and 4gb of ram or do I need to be seriously considering 2.66ghz and 8gb of ram. I just have no idea what to pick for the optimal experience and I'd hate to just go wild and upgrade to the hilt un-necessarily. Thanks to anyone who has any advice on what I should be doing here. As an aside, the WIN7 side is only going to be about a 25%-30% time usage, the bulk of my time will be spent in OSX, but I don't want the WIN7 time to be frustrating, laggy and slow.