Need Help Fast!!! Which Mac is Best?

I just recently lost my recording studio... they were $10 an hour Pro Tools & Logic Pro 9... now the owners are gone. I have to finish my album before the deadline of my local venue.. and I need help with choosing a Mac... I am a singer who produces music and records... I need a Mac fast to help but theres one problem... My budget is capped at $800...

What do I get? Thanks...

TheGuyCool...