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New computers are pretty darn fast these days. Unless you want to run
lots of VST plugins at the same time or do intensive things like video
editing a mid-range processor will be fine. For basic looping I doubt
you can even buy the minimum processor any more, everything will be
more than you need. A 2.4GHz Dual core is plenty.
I'm not sure what "video control and projection work" means. If it
is just sending occasional control messages to a video device then you
don't need much. If you are actually doing real-time video
processing on the computer then you may need more.
Whatever you do get 2GB, memory is dirt cheap right now.
First set a price range. There are roughly three ranges: above $2000,
between $1000 and $2000, and below $1000. The Macbook you mention
(assuming we're not talking about the "pro") is around $1300. The
Macbook Pros start at $2000.
If you're trying to go below $1000 then you will have to look at PC
laptops. You should be able to find something that meets your needs
but it is a gamble. You don't need the fastest processor available
but at the low end corners get cut that can affect audio performance.
You will want a video card with dedicated memory, some of the low-end
laptops may not offer that.
You will need to factor in between $200 to $500 for a firewire audio
interface depending in your needs.
If $1300 doesn't bother you then think about the software you want
to run and make the Mac vs PC decision.
If $2000 doesn't bother you then I would agree with the others,
get a Macbook Pro and be happy. You can still run XP on it if you
want PC software but you will have to buy a license which can be tricky
if you don't have one laying around.
Jeff