Anything 7th gen or after, use component or HDMI. The Wii is best with component and it's the highest quality cable you can get for it. With PS3 and 360 HDMi is best.
I have to say, after being quite a perfectionist when it comes to picture and sound quality for my games, I've found the perfect TV and set up. I actually don't use it for HD consoles, but it also works perfectly with those too!
The Sony Bravia 22EX310 22 inch is amazing for retro gaming. For one, it's easy to tune and set up for aerial/RF cables whilst many new TV's are harder to tune due to being digital nowadays.
It also has a great SCART socket which works wonders with older consoles. I've hooked up my Mega Drive and my GameCube and they look fantastic. It has component cable slots (the R/Y/B/G/R ones) for the Wii and that looks crisp and clean too. It has two HDMI slots for the Xbox and PS3 or whatever device you want to attach, built in headphones jack, the usual old R/Y/W cable sockets for older consoles that don't use SCART/RBG slots too. The only thing it's missing is an S-Video which no one uses do they?
As a plus, it also has left and right audio out connection points for HiFi systems and a PC input too.
It has a range of settings, of which I can give advice and help with, though it's easy to set up. It even has a gaming preset picture style which works great for older consoles to give them smoother images if you like to have your games a little less sharp but still with good detail. Bearing in mind many older games are built specificaly with slightly blurer low quality pictures in mind this is particular useful. The Mega Drive is known for this. Games like Sonic and The Lion King take advantage of a visual effect called dithering (see http://retro-sanctuary.com/comparisons%20-%20differing.html%20%20) which means that the softer the image, the better some games will look. It's good to have a happy medium.
I'll upload some photos if anyone wants?
£300 it cost me, and frankly it's the ultimate TV for everything, especially gaming. I love it.

