take it from me!
nets are fine, but a waste of money in my opinion. also
DONT GET ELASTIC BANDS!!!
they SUUUUCK. I have one, and damn im pissed I bought it. in fact, if been looking for a new trampolien recently and found a few intresting things.
you can get rectangular tramps (better bounce) for around 1,500--but thats kind of expensive. If you see one on ebay thats bigger than 10' by 15' for sunder 800 or so, id buy it.
other than that, try and look for a new circle tramp that like 15'; they usually sell for around 500, but if you find one for cheap, then thats great.