Computational Ability to Handle Super Big Excel Files

My son lives overseas and is in the business consultancy business. He will be visiting us in the USA next week and plans to buy an iphone (if there are any available). He is a committed PC user but is getting frustrated with the computational slowness of his laptop PC when handling really large Excel files. Large = 15 linked excel files each averaging about 400 megabytes. Remember, his business is based on running iterative analysis of spreadsheet variables so there is considerable processing going on.
Question: Would the fastest MacBook Pro dual Intel processor model be better at handling these large files than a fast PC laptop, i.e. would the MacBook Pro offer him processing advantages? Would he also be able to let the Excel program grind away in the background while using the Mac to do mail messages and other work concurrently? I'm thinking that if he gets an iPhone he should go ahead and get a Mac and have the best of all worlds. Your comments are appreciated.
Thanks,
Bill

Well, if he runs the Win version of MS Excel under Bootcamp/Win it will run at the same speed as on an identically specced PC notebook - no idea how many PC notebooks with 2.4 GHz Santa Rosa chips, 4GB RAM and an comparable graphics chip are available though - if they exist, the MBP should be competitive in price and will run almost any OS (using Bootcamp or Parallels).
The story changes looking at Office for Mac - the current version is not Universal and runs under emulation - it will be slower than the Windows version, the future MS Office for Mac will be Universal, but will not support VBA/scripting - this should make it unusable for your son (I am sure these multi-spreadsheet applications rely heavily on scripting).
In general OS X handles multi-tasking a bit better than Windows, so yes, having a demanding process running while working in other apps might be slightly better.
Cheers,
Uwe

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