RE: YS Longevity ?
Dmacsimum,
Reading through your post I thought I would mention this thing. You do not need a high-torque starter for YS. If you want to buy a nice Sullivan just because it is a quality piece of equipment, then do, but if you were thinking that it is necessary in order to turn over the YS, don't worry. I still use my old Tower Hobbies starter and it spins the YS from 63 to 140DZ without any trouble.
On fuel, I would think that Wildcat YS mix would be just fine. I use Coolpower because my other choices are brands that I have no experience with. Coolpower is the only American brand of fuel here, others are Tornado (from the UK I think), and then the German brands from Robbe and Graupner that where excellent at gumming up my little 2-strokes.
Mark