pc laptop question

[Joel Stern <sternjoel@xxxxxxxxxxx>]

i'm comsidering buying a pc laptop and wanted to ask a couple of questions 
to which i wouldn't entrust the guy in the shop.
firstly in order to process audio in real time (using a split line in to 
audiomulch/reaktor) through quite a few patches, what kind of capabilities 
am i looking at?
secondly, anyone had any experiences which suggest the sony, dell's, 
toshiba's etc. are more suited to audio processing/editing?
any advice would be greatly appreciated.
joel
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