my 30" crt tv is starting to die, so i'd like to replace it with new technology - a HDTV. i've read up on the different types, and i prefer the plasma displays (or maybe sed if i can wait). the problem is, in a showroom i visited, i thought the pictures looked terrible (on all HDTVs - lcd, sxrd, etc.). the source used was satellite tv not HD. the dvds looked great on the plasma, but not regular tv channels. is this a condition of HDTVs, they need a high definition source to look good? will broadcast HDTV look great on these tvs (current in my area only some programming is in HDTV)? i currently only use roof antenna/broadcast programming, and i don't see the incentive of paying for cable or satellite tv if the picture isn't any better (digital channels on cable or satellite are even more expensive, right?). i don't need more channels, i just want a great looking picture, but it seems moving to a HDTV is actually going to make my tv picture look worse!? any advice or help out there for me?