Where I work we always can use some extra monitors, and this summer bought about 10 of these (well, the slightly older version). They're not the fanciest thing on the market, but they have a pretty good picture, good warranty (3 years), included all the cables, and seem to be holding up well so far:
http://www.amazon.com/Acer-G206HQL-...UTF8&qid=1423280227&sr=8-1&keywords=acer+19.5
We got a volume discount, so they ended up being around $80/each and they were a nice upgrade from the 2003-era 15" LCDs for those particular computers.
Previously, we only bought ViewSonic displays because of their warranty (3 years), overall good quality, and good prices. The Acers were a bit of a test run and are holding up well with 8+ hours/day usage.
For just a little more, this is also a pretty good option - I have one of these on my desk at work and it holds its own in terms of picture quality next to my 21" iMac - if you get this, make sure you get the "M" model and not the cheaper "A" model - the "A" one doesn't have a DVI input:
http://www.amazon.com/ViewSonic-VA2...=1423280518&sr=1-1&keywords=viewsonic+va-2037
Finally, probably a bit out of your budget, but this is the monitor I use at home with my MacBook Pro - it's IPS and has a LG panel that is in leagues with Apple's displays (LG is the supplier for the iMac and Thunderbolt Display) - although your situation is a bit of a band-aid, this could be nice to pair with your next MacBook:
http://www.amazon.com/ViewSonic-VX2...423280604&sr=8-1&keywords=viewsonic+vx2270smh