mtec wrote:i would recommend a macbook or macbook pro,very fast and very stable.
I second that, I've been using a macbook for more than a year for my live shows.
As long as you take some things in consideration, you'll have no hassle at all.
First of all, use at least 384 samples latency. It's a perfect compromise between stability and delay when playing keys.
Secondly, connect your usb audio interface to the first usb port on the right and the rest of your stuff (or a hub) to the second one. However, I'd not recommend a usb powered interface or worse, an m-audio firewire one. I have a blackbox and it runs fine.
Yesterday I had a TF, an axiom 25, another axiom 49, and an O2 connected through a hub. The blackbox connected to the other port, and all wav files on the original 120gb internal hd. It's not even a C2D but the first coreduo. Well, no single problem here, still lots of plugins, something like 40. I had 30% cpu charge in the worst case. No clicks and pops.
The only cases I had problems with were with less than 384 samples latency (pops clicks) and the lack of usb power when using improper usb cables (get GOOD ones).
Once you respect that, you'll have no problems at all with your macbook.
I'd go for the macbook instead of the mbp because it's smaller, and you can change the hd on your own.
L.
Dell told me that there is no specific HD available for the Inspiron6400, for sure it is possible to get a bigger one, but i think i will sell this 6400 to buy another notebook (2x2,2ghz and 300GB HD). I have got an external HD too, but only for safety !! Don´t like to take it to the clubs ! 
