I believe the Brio R is the current model, and not that old? At any rate, it has a great rep even if it's only 50 watts. For a medium sized room, you could be fine as long as you don't over tax the amp, and that is the issue. I find that 90db is pretty loud, and in your room that might be drawing 6-8 watts per channel, depending on your listening distance. If you can be happy with that you should be okay with the Rega. I guess the question is, what's loud to you?
That price is also pretty good, used they are listed at 500+.