ha funny you should mention; I was in the same situation last week!
I went with the S1000RR over the RSV4 APRC for a few reasons:
-I wanted to try out the race ABS
-S1000RR is faster
-RSV4 dealer didn't even have the navigator to update mapping
-S1000RR was cheaper
-S1000RR had more warranty (and less likely to break)
-BMW customer service is a million times better than Aprilias
-I looked way too big on the RSV4 (6'2" 220lbs)
and some other reasons that I forgot.
But the RSV4 is a beautiful machine with great sound not to mention relatively rare. Not much good if its broken down though. It was a tough choice!
Since you're on the S1000RR forum I think we already know you're about to make the right choice

Best thing to do is buy both!!
After I took the S1000RR out for a good ride in the twisties I forgot all about the Aprilia....