There are some flatscreen monitors around that have a TV interface and they are called hybrids. I think they have the quality of a PC monitor. I stumbled upon the
P2370HD LCD end last year, but I don't know if it's good enough for Photoshop.
Most of the HD television screens have a PVA panel, unlike the the samsung syncMaster P 2370 who has a TN panel... to be honest the P 2370 is actually not a TV screen, it's a computer monitor with build in TV tuner. Both Samsung an LG made a lot of those computer screens, mainly for children rooms... two appliances for the price of one...:-)
Want a computer monitor with PVA panel, the Samsung SyncMaster F 2380 is a fairly good choice for little money but don't expect the same quality and performance you will find in the higher priced segment.
http://www.loveno.be/product/17854/Samsung-SyncMaster-F2380-23-inch-wide-TFT-8ms-DVI-Black-.htmlReview :
http://www.xbitlabs.com/articles/monitors/display/samsung-sm-f2080-f2380_6.htmlPatrick.