"I am using the componet cables and some games look really awesome but there are game such as halo 2 that contrast is horrible (very dark). "
yeah on my set as well, for some reason Halo 2 is darker in 480p than 480i as well.. Halo 2 is truly a game where I have to turn up my settings to play it, quite annoying.
Other than that PS2, Gamecube and Xbox all look amazing on my 65" CRT RP HDTV Hitachi 65T500. The xbox in general puts out a darker picture than the other two consoles, not sure why that is. But I've tested at my friends house on his tv and also on direct view CRT, same results.
My set is calibrated to the DVE disc, but yes I do turn up the settings for a few xbox games.