Haven't skied the 8 yet, but have used the Contact 10 in 172 off-and-on for two season. It is very stable in most conditions you will find inbounds, realtively easy to ski and forgiving. While some skis, like the 4x4, will want to be on edge and don't really shine at soft-edging, the 10 will pretty much do anything you want it to, even at walking speed. Being of similar stated ability levels, I can tell you that it won't overwhelm you on the groomers and you won't out-ski it in terms of speed or performance. It has enough high-end to be able to advance without having to worry about it becoming obsolete after a while. It's probably a ski you can have around for a good number of seasons without outgrowing or becoming bored with -- unless you come accross a ski you like better. Since it seems like you don't swap gear every season or two, I would say it would not be a bad choice.
Also, the 8 is getting real good reviews and I actually just ordered a pair. I really can't compare them but will say that Fischers have a unique feel to them that Dynastar does not. I know that's a generalization, but I have found Fischers in general to be very light,solid, and quick feeling, with lots of snow feel. Dynastar tends to be much more damp and solid feeling underfoot -- at least the ones I have tried. If you want something real peppy you might try demoing the Fischer. The Contact 10 is fairly quick but has a unique and easy-going character to it. It was the ski I went to in the PM when I started to tire a bit.
Edited by MojoMan - 11/17/09 at 12:15pm