I don't know how they compare for riding style, but I've only read great reviews for the Evil Twin. It's suppose to be a great all round shred stick. Sounds like what you're looking for. Have you looked into Never Summer SL-R? Those are also great all round boards that also kill in the park. I don't know much about the Riot, but like I said I've heard the Evil Twin is very versatile and rides very well.
Don't worry too much about the base material. If you're not hitting park all the time best not to get extruded, but all the boards mentioned have sintred type bases. So whichever you prefer.
155 sounds about right for your weigh and style of riding. If you want to hit park more maybe take it down to a 152, but if you're a fast rider 154-156 would be most stable.
I find them harder to find online, let alone buying last year's models. I think they sold well last season, so you might have to fork out the cash for a 2010 at this point in the year. Generall buy previous year stuff before October or you'll be SOL. I recommend finding a local shop with them. Always check your gear out in person, even if you decide to buy online. But if you gotta pay retail, support your local shop. I'd even pay a tad more to support the local shop. Buying online is generally a bad idea anyway, for a lot of reasons.
Good luck, have fun!
Last edited by Anor; 11-05-2009 at 08:46 PM.