I have a VPI Classic. Having played/modded a Rega P5 with good results,I'm sure the 10 is in another league.
After checking out what the Classic Sig has to offer, IMO the VPI would be my choice without even hearing it.
Since you are considering carts under 2.5k, I would include the Lyra Delos and Kiseki Blue. Another that seems to be under the radar is the Audio Technica ART9 and 7 for value at 1k. I am using the ART 9. The thread here on Agon represents the small cult following.
Unlike the Rega, the VPI can rise above its already great performance with dead accurate speed contol(SDS/Phoenix) options and others to take it to another level. Id be interested in seeing an RP10 with a Phoenix tach to see the speed accuracy. Also the VPI has arm adjustment parameters to take advantage of a super cart which Rega arguably doesn't.
Get a Soundsmith Counterintuitive to save yourself grief when setting up the cart for the VPI.
I'm aware the Rega is an entirely different table design compared to the VPI, but at this price point, at least It feels like(weight) you're getting something for your money!
I will be following this thread to read your thoughts on preference.
Happy Listening!