Simpsons Commodore X3 in best. It has a great shape and is just a nice all around brush.
Past that get a hold of Rudy Vey. He could put something together for you easy for less than $100. Rudy typically uses TGN knots, and the 22mm Super Silvertip knot is great. It is exceptionally soft and of medium density. I have one that was a very nice cream brush at a 48mm loft. That makes it a smaller brush to me, but its very very nice. The TGN 24mm Silvertip Grade A is also very nice and a little bit bigger. You will trade a little bit of softness for a slightly bigger knot. I also have a brush with this knot and its very pleasant set at 50mm loft. I face lather with it, so even if you set the loft at 55mm I think it would still be nice.
"Loric=Ernest Shackleton of SBAD" - Krona Kruiser