/waits with anticipation for replies...
Julia, you going to use the wing for buoyancy when you get your 7's? Out of interest I used (tried to use) my BCD for buoyancy the other week - was interesting to say the least - like learning to dive again. Manageing two forms of buoyancy on ascent was a pain - but to be fair we were bumbling up and down between 5-10 metres, and I have a weezle undersuit with lots of air in.
Would be interesting to hear how you get on when you get them... And just to let you know, cheapest price found so far is Go Dive for £299 c/w MDE valves, single boots and stainless bands...
All the best...