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Not really a fair comparison - the 550 is a good bit more expensive. Very roughly:
X10 - 450
S10 - 550
G10 - 650
V10 - 850
There are a lot of differences though, and which is better depends on your uses and preferences. Do you watch mostly SD, or HD? How much light/sun glare falls on your screen? Do you prefer deep blacks, or better colours? How far away do you sit from the set, and how sharp is your eyesight?
The anti-glare coatings on the x10, s10 and 400/500 models are pretty basic. Any possibility to rearrange the viewing room a bit? This can have a major hit on pic quality for plasmas, even the expensive ones with top end coatings.
-Well, i would like good colors and deep blacks, if possible. So, which one is more balanced in this matter?
Assuming your glasses bring you up to 20/20 (not always true if they've not been done recently!), at 8 foot a 50" 1080p would be ideal. However, if you're going for a 42", you'd need to be around 6.5 feet away to see the full benefit of 1080p - ie if you're further away at that size, a 720p set is much the same. This is doubly true if you're watching mostly SD anyway.