For your use the only type I would consider is a non-TN based screen - IPS or PVA. The only trouble is that they are significantly more expensive. On the plus side they offer much better colour reproduction & viewing angles.
Some examples are:
22" Dell 2209WA click here / £215-225 click here & click here (for user reviews click here)
23" Viewsonic VP2365wb click here / Which is about £200 if you can find one in stock
24" Dell U2410 click here / £455 click here
I've suggested PCBuyIt as a possible retailer to purchase from as they have excellent warranty terms. G