These things are always highly personal, but I find Provia 100F to be an extremely well-balanced film for "natural"-looking colour reproduction. In full sun it's just fine with no filter; any amount of shade and it requires a warming filter to keep it from skewing blue. To my eye, Velvia is unnaturally saturated with the "Crayolachrome" look, Astia looks bland, and the Provia porridge is just right.
Rollei CR200 (apparently the same emulsion as APX200) is cheap as dirt and has a very nice, warm colour rendition (slightly better at EI 160 than 200, IMHO), but I found it too grainy for my taste in 35mm. It definitely has character, though, and I wouldn't write it off without trying it.
-NT