Well done, ADM - I knew you had it in you!
Whiters, there is little unknown about RYR now. A look through this board will familiarise you with the problems with basing, leave and taxes that come with the FO contracts. Do not plan on getting a base you want - it may happen, but don't plan on it. Count on getting moved for two years on promotion, in the unlikely even you don't move on to bigger, better things by then. On the plus side, it's about the most secure flying job in the EU and if you keep your nose clean and score an average training record every six months, you'll be a captain in 4 years (less at the rate we're losing them).
Turbo prop is indeed a career dead end. The experience these guys get would be an asset and the snobbery of the jet operators unfounded, but that's how it is. Also consider that turbo-prop operators are small, their pay less and their futures much less certain; not many regionals are thriving in the current market. Flybe and Aer Arran are the two biggest in the UK and both are seemingly having difficulties.
I would recommend going for the RYR contract and using it as a rung on the ladder. Some are happy in the company, but they're a minority and 900 hours of intensive ops in all weathers on secondary runways is not a good long term prospect - it's great in the short term for gaining experience and proficiency, but it's very wearing 15 years on... The good news is that Emirates, Etihad, Qatar, Norwegian, BA and Virgin are all keen on our guys (and EZY's who have very similar standards and operation), so RYR is a good line on your CV.