i use one of these Rich
http://www.galatent.co.uk/more_detai...ItemCode=07302
4 of you can pit in there comfortably, the roof is totally waterproof.
if it does ever blow in you can get every part for it as a spare & i think they're still doing a bit of pre season discount too
the only downside is its a bit heavy, but its easy enough with 2 of you
plus with extra room in there you'll soon attract some new friends lol
maybe one of the smaller ones if thats too big?