The best professional 19" monitor from a price/performance standpoint is the Samsung Syncmaster 900NF. I would stay away from the Sony E series, if you must have a Sony get the G series instead - though I feel that Sony is WAY overpriced.
Here's how I would rate 19" monitors based solely on features/price:
1) Samsung 900NF - BNC inputs, great refresh rates, and a great price.
2) Viewsonic PF795 - Might be slightly better than the Samsung, but costs a good bit more.
3) Sony G400 - Good refresh rates, but no BNC inputs. Way overpriced.
4) KDS AV-195TF - Older Sony tube, and no BNC inputs, but extremely competative price wise.
5) Viewsonic PF790 - Good monitor, just not as good as the others on the list.
If you plan on running your monitor at high resolutions I would recommend getting either the 900NF or the PF795 - the BNC inputs help out a bunch. As always, make sure to take a test view of the monitor(s) you are going to buy.