local assistance required

Hi guys, local advise needed, I am organising a rally for the RN and I will be bringing a team of approx. 20 cars/bikes on a uk rally, however not knowing wales I could really do with a bit of local help.

the route I have chosen to get to our first night in Brecon is from the bridge (we will be coming from Portsmouth via cheddar gorge) up to Monmouth via the A466  then cutting across country on the B4233 towards Abergavenny then up the A465 to go over the capel-y-ffin (not sure of road number) then heading back down to Brecon - what would be the most scenic way to head from that location back to Brecon.

And of course if anyone would like to tag along your welcome to meet the team at Chepstow. or nearabouts.

All the roads in that area are scenic.