Rega or VPI


I currently have a music Hall MMF-5 with a shure V15VxMR cartridge. My local dealer has a Rega P25 with the RB600 tonearm, on consgnment for $750. I am tempted to snap it up. Would there be a noticeable difference in the sound quality? Would I be better off waiting and spending a little more on a VPI? Would the Shure be a good match for a while?
jdodmead
Thanks for all of your responses. I think I can even take the rega home and demo it, which I am considering. I just won't be able to compare it with a VPI. Without sounding stupid.,what makes the VPI's so special? The tone arms seem to be compareable and I see a lot of the VPI's use the Rega arms. Also will the shure do the table justice?

Thanks
Jeff