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Perhapps you'd be better off getting a teleconvertor rather than going the whole hog and replacing the lens. It would cost less and a 70-200 converted into a 140-400mm would still have a lower minimun aperature than the 50-500.
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I just went down this route, i.e. Sigma 70-200mm f/2.8 with a 2x teleconverter, and was impressed with the hardly noticable reduction in speed and performance. I got the teleconverter specifically for the F1 testing in Silverstone last week and used it again for the British GT championship last weekend.
I've been shooting with the 70-200mm for 18 months and love it to bits. It's fast focusing and really sharp. Flare hasn't been a problem and headlights, etc, produce beautiful 8-pointed stars without any filter.
The only thing this combo doesn't have is VR. I would see that as a valuable thing to have and wish I had it myself, but I have also been hand holding this setup down to 1/250th.
There are some samples below. I've included a heavily backlit shot so you can see how the lens handled it.
-Mark.
http://emotiveimages.com/eigallery/F...SC_0501?full=1
http://emotiveimages.com/eigallery/F...SC_9890?full=1
http://emotiveimages.com/eigallery/F..._Alonso?full=1
http://emotiveimages.com/eigallery/B...SC_1228?full=1
http://emotiveimages.com/eigallery/B...SC_1215?full=1
http://emotiveimages.com/eigallery/B...SC_1116?full=1