Sony doesn't doesn't make LCD pannels ...most of there LCD pannels Sony uses in their flat pannels are made by LG-Phillips LCD....
There stuff is solid, it works its is reliable but there is plenty LCD moniters which
If you were the buy a LCD.....Samsung could arguable be the king........
I would get the newest 15inch Samsung which is the Syncmaster 152T... Its picture quaility is really good.....The 152 series is just the improved version of the 151 series...mainly with a better contrast ratio and higher birghtness.......
About DVI...
RGB===> you mean the 15pin D-sub mon connector.....
Almost all 15inch mons support it..........
If you are talking about the Eizo 375 which only has 2 x DVI terminals......It still supports the 15ping D-sub Mon connector....It comes with a 15 pin d-sub ===> DVI-I cable as well as a DVI-I to DVI-I cable..........
The perfomance of the standard 15 pin cable and DVI at 1024 x 768 is very similar......(at least with high quality LCD mons).......
with cheapers stuff, you might run into trouble with phase issues......
So which is the best 15inch LCD..... I would say its going to have to be the Eizo L365 / L375..(but the price is completely off the scale)