Just the same dilemma I sat with a few weeks ago. I had been using a wiffy monitor for color correction purposes with no good results.
As far as monitors go, your first choice would be one which is calibrateable NB! - including a Blue Check function for checking chroma gain and phase!
Now you need to decide whether your delivery is HD or SD. At this moment in time, most are still delivering to SD, unless you do broadcast work and deliver HD. If you are delivering SD, you options become a little cheaper since you need only a SD monitor.
As I'm typing this, I'm seeing an advert on the same page for the new Panasonic 17" LCD monitor which I have seen in action - very coooolll! Even got a built in waveform monitor BUT it comes with a $3400 price tag! Also its a 1280 x 768 - still not pixel for pixel HDV!
Since my current delivery is to SD, I purchased a SD monitor with SDI inputs. Yes, its a 750 line but perfect for my current delivery platform. When HD becomes more common place, I'll get a HD monitor and use my SD monitor for SD work.
One device I am aiming towards is this little baby:
http://convergent-design.com/CD_Products_HDConnect.htm These guys seem to have their act together. Also got a brilliant SD box and they WORK with Vegas - a bit pricey but good kit.
I must be honest in that I am biased against the Blackmagic since what I have read so far hasn't impressed me.
Sooooo - where to from here?
SD or HD - make your choice and work from there.
Cheers
Jeremy

MJ Productions