I'll save everyone else the bother and say it straight away: DD Hammocks.
They do various sizes, including the ubiquitous 3x3 and they do lightweight versions as well (not that standard ones are that heavy to start with with).
For the money they are as good as they get. You can spend more and get 'better' (some have commented that the DD ones tear around the hitching points, but that seems a rare occurrence, so I wouldn't get hung up on it).
If you prefer something camouflaged then you could still go with DD (they do a multicam one, though I think it is a VERY poor multicam with the pattern very obviously repeating itself so that it ends up looking like a pair of curtains. Personally, I wouldn't touch the DD multicam tarp, though others love it), or choose something military. A military basha is slightly smaller - most seem to average out about 2mx2.5m. But there is some variety with some slightly smaller, some slightly bigger.
It depends what you want it for. You won't go wrong with the DD 3x3m. That's a good size that offers versatility - it gives you enough 'play' room if it's raining, is big enough to use with a hammock, could be shared with another person, bit of shade on a hot day. There may be instances where you want something bigger or something smaller, but the majority of the time that size will see straight.
Having said all that, and despite also owning a DD 3x3, the tarp/basha I use most of the time is actually one of these:
http://www.sofmilitary.co.uk/highlander-multicam-basha-25x17m-hmtc-product,15362
Best of luck!
