Well - at 150 you can rule out the Elixir - nice kite, but not too cheap...
IMHO the Gem is hard to beat - It's a very accessible kite (was the 1st one I got) and relatively forgiving. If you're looking at the lower end of the range you could look at the Gem UL - it's a few quid dearer, but gives a few mph at the lower end of the range.
A personal favourite of mine for lighter winds is the HQ Breeze - Flies really well and does some gorgeous flat spins - 540s and Slots are sweet. They're only about 80 new, so you'll have a couple of quid for beers
Just my 2p
Gotta Fly