Another vote for Marlborough Connection.
I've never done Poor Student outside of January, but I would imagine it would be very different on a warm day, and it is nearly as picturesque as Mar.Conn.
Steve Poulton's New Cheltenham Flyer is indeed a lovely route* (has it taken over from "Cider with Rosie", which shared quite a bit of the route?). This could easily be paired with either Marlborough Connection or one of BlackSheep's rides, or indeed another of Steve Ps
*except the bit near the end up the A436 from Seven Springs, which was ghastly on the calender ride. Can be easily avoided on minor roads. The perm might avoid it anyway.