Yah, but you may get a second hand one...so look hard
Mac vs. PC.
I have this arguement all the time.
I am a Mac user. Have been for time, will be for time
Reason? I have about $10,000 of software and hardware tied up in Mac/SCSI/Firewire.
That, and they kick ass
But, for a beginning producer, I'd worry more about learning the ropes before comitting to PC vs. Mac vs. PC whatever.
PCs = more affordable, more software out there, more freestuff, you can generally kitbash one together for cheap, etc.
Macs = more posh

, all the good software is available (except games), in my experience (I've worked with Macs and PCs for the last 12 years as a network admin, technical specialist, and even now as a therapist) a more stable OS/hardware
I think there's a kind of merging of the markets at the moment - the high end audio stuff is coming out for macs and pcs roughly at the same time (PCs first tho usually) and what was once mac only is now on PC and sometimes vice versa. However, in going to ATA drives, Macs have come down in price while retaining a lot of their reliability.
The ability to burn DVDs/CDs/ have firewire AV input etc. right out of the box is nice, if you have the cash to use them. If not, you might be better getting a PC without them...Adding them later can be a hassle tho...
Budget is important - long term commitment is important
WHat you know how to use is important
what your friends know how to use is important
What you're going to use it for/with is THE MOST IMPORTANT THING THO
and that usually means software...
JJ might have some more pearls of wisdom as may DC on this mac vs. PC thing.
um...let's see...oh yeah...I meant audio input...what are you using now?