the usual recommends for receivers include denon, yam, onkyo, marantz, maybe a couple others. do any of these manufacturers low end models stand out? or, is there a price point or model in their line-ups where you don't want to go below because they build with clearly less-than good enuf internals? i'm considering what to get for a mostly kid or second system. i see the adds for onkyo and yamaha on sale for under $200 pretty regularly. are these 'bottom of the line' receivers to be avoided? or is it significantly worth spending $50-100 to move up the product line and get a much better system? or for that matter, at the low end, do i do just as well getting the sherwood for $79 and replace it in 2 yrs?! thx ...