Yeah, it can be done but it will require a Mini DisplayPort to Dual Link DVI adapter.
Don't bother with that adapter, it's trash. I've gone through 6 of them.
Is there any alternative?
If you by a 30" Display with a Display Port, then get a MDP to DP adapter. I've heard this works great.
If you had a 17" MBP would you buy a 24" or 30" display (Apple or otherwise)?
I suppose - you have to find such a monitor though.