For TV, i don't know about their colour.

But for Monitor Dell U2412M. here's the information.
For working with photograph, which i assume you will be using Adobe Photoshop, you would probably need a true 8 bit panel for your work, which offers above 80% color accuracy.

But they are much more expensive, you can look at Dell model U2410, U2711 or U3011.
These uses H-IPS Panel which offers 8bit or 10bit(8bit +A-FRC)

You can have a look at Dell Monitor U2410 information below.
Added : Info

IF you want cheapest solution, i recommend you spend RM50 get a cheap CRT Monitor for photo working, they have perfect color compare to all current LCD.

CRT is still the best color reproduction monitor. There's still many big company uses them. because they provided no input lag and best color reproduction that LCD can't even beat.