are the newer models any better in terms of reliability? i had a launch unit a couple years ago which failed on me. got a refurb which has been doing fine, but now its starting to go bad. no rrod or anything, games just tend to get disc errors or the screen goes blank more often than usual. i'd rather not go through the whole warranty process with ms again only to end up with another refurb. so basically i'm thinking about buying the arcade version (if they're better) and just swapping over my hd and what not? any thoughts?