IMO, your going about it the wrong way. Usually one get the speakers first, as they are the only component you can actually hear, and then one finds a suitable amplifier to properly drive them.
But it seems you already have the Brio and are locked into it. So I suggest you understand it's output capabilities and then find speakers that have the proper specs (impedance & sensitive) that the Brio can meet without breaking a sweat. And by all means, audition the speakers to find the pair that sounds best to you, your amp can properly drive and are within your budget.
The Rega is not a powerhouse at 73 wpc in 4 ohms and there is even a warning on their website to be careful driving 4 ohm loads. I would take this to heart and stick with 8 ohm speakers within sensitivity ratings at 90dB and above and you research and develop your short list. Your Brio will be much happier.
But it seems you already have the Brio and are locked into it. So I suggest you understand it's output capabilities and then find speakers that have the proper specs (impedance & sensitive) that the Brio can meet without breaking a sweat. And by all means, audition the speakers to find the pair that sounds best to you, your amp can properly drive and are within your budget.
The Rega is not a powerhouse at 73 wpc in 4 ohms and there is even a warning on their website to be careful driving 4 ohm loads. I would take this to heart and stick with 8 ohm speakers within sensitivity ratings at 90dB and above and you research and develop your short list. Your Brio will be much happier.