If money is no object, then the microdrone
www.microdrone.com is the way to go, it will run into 18-20k (euro)
If money is an issue, buy the savs, i have run this excersise and there is no middle area. save your money, buy a savs, a few blades and sapres and get into it.
come to think of it you could buy two savs and still have bucket loads of cash left over compared to the alternatives.
Marty