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Question: Sony KDL-42EX440 OR Sony KDL-46XBR9 ? NEED HELP PLEASE ASSIST !

I`m currently looking for another Sony Bravia HDTV. I can not decide if I should get this Older Model 46" KDL-46XBR9 or a Newer Model 42" Sony KDL-42BX440 which is currently on sale on sonystyle .com for only $579.99 as well as Best Buy.
The XBR 46" Model I will be buying USED off craigslist for only $400.00 (Suppose to be in great cosmetic condition) However I`m more of a Picture Quality Person rather than a Picture Size Person.
I`m looking to purchase 1 of these 2 Models within the next 2 days so PLEASE reply to my question about which Sony Model I should go with. I would Greatly Appreciate ANYONE taking the time out to assist me.
Thank you so much!