This might be a bit too late for the OP, but I can chime in for the MEC sil tarps from my experience.
I tried a Scout sil tarp and the bigger, guide sil tarp.
The scout needs to be pitched opposite since it's 2.1m X 2.9m, so you'll get seams going down your top, but no biggie. It's really light, and has adequate clearance on the sides. I would be wary using this in rough wind/weather only because of it's small size (granted i'm a bigger guy using an ENO DN)
That being said, I switched to the Sil Guide Tarp at 2.9m X 3.9m (this year they have a sour apple color, which is really neat) This thing is massive (779g) , perfect length to pitch normally, and I would bet you can fully close this thing around you (i'll have to test this out) It's great pitching patio-style, lots of room for others to hang out underneath. I love this tarp for it's sheer size and versitility, however I do use a smaller tarp more regularly when solo camping 3 seasons.
Anyways, the scout tarp is pretty nice for UL or minimalist inside some of us, but too small for 'my' liking. For that price you can pick yourself up a better one as suggested above.
Hope this helps someone And for the Americans: http://www.metric-conversions.org/