HD is super but .... !
High Definition cameras are Super ! I myself have been filming HD ( using a sony HC1 ) for almost a year now.
But beware ! there is lots of stuff they don't tell you ...
- dont fall for the Harddisk based ones. 4 hours and the drives are full. so if you go on a multiday / multiweek trip : bring a laptop with PLENTY of storage space ... so you can dump the files
- the direct to DVD macines : only blue rayplayers can handel the discs. you cannot play back in normal dvd player ( i am talking about the HD cameras that record to DVD . for SD there is no problem
and then editing , and this is where the frustration begins.
if you want to do anything with your HD video on the computer you need horsepower.
the bare minimum is the fastst dualcore with 2 gigs of ram. and that machine still crawls ... especially when you start doing color correction and fancy effects. ( even a simple 3 second crossfade kan take 1 minute rendertime ... )
if you want the editing to move think about quad cores or 2 physical processors ( Xeons or Opteron64's ), or go for a hardware solution like Matrox RTX2 then everything becomes realtime ( you still need a very powerful pc. again the bare minimum is a dualcore with 2 gigs ram )