I always heard nothing beat the 105 for that--low level anyways. My heart is at low level because of my A-10 time. . .one of the slowest, but not ugliest (US Army has that with their ELINT platforms).
The F-4 was a fast one, that is for certain and for sure, but I think a stripped F-15 (no paint and no points) is about as quick as anyone can imagine. Friend of mine flies Depot maintance on those things and the stories he tells when he takes a stripped one out for a spin are really amazing.
With regards to your F-15 and A-10 time and your friend's, my jealousy cup runneth over! And, fwiw, I think the A-10 is a very handsome machine. To be truly ugly, something just about has to be British, with the notable exceptions of the Spitfire and the Vulcan.
Perhaps you can answer something for me. The Powers That Be want to phase the A-10 out and maybe use it for FAC while replacing it with the F-16. The argument is that faster is better, even though it is softer. WTF, over? My money's on the A-10. Care to compare?