ok, i am planning on building a portable recording studio and need some pointers. first, i am planning on buying a mac notebook exclusively for recording. it has a speed of 2.4 ghz with a core 2 duo processor, 250 gb hard drive and 2 gb of ram. i want to do multi-track recording (probably with cubase le4 to begin with) but was told there would be latency and would have to get the mac book pro (which is 1000 more.) is this true? if not should i get an external hard drive, more ram, etc? I am also planning on getting a Tascam US1641 (http://www.zzounds.com/item--TASUS1641) for the audio interface. to me this sounds like a good choice but would like opinions. also when i do get a mixer does it matter if its a digital or analog with this interface?