Turntable mat options

You are likely to get as many opinions here as there are mat options... Lol.

I feel you can do a lot better than the felt mat for sure, however as the Rega does not have adjustable vta your options may be a little more limited.
Yes you obviously can adjust the rp8 vta by shims or spacers under the arm itself to raise it for a thicker mat but a bit more of a pain than vta on the fly system.
You can buy fairly cheap examples of cork and vinyl mats on eBay.
I suggest buying a few and trying them and see what you like.

On one TT I prefer a mat that’s a hybrid of leather and lead.
On another I prefer using a 10" 78 album as a mat.
You don’t know until you try!
Relatively cheap fun.

I will be trialing a new mat in a couple of days made by a member right here and will update with results.
I expect it to be a winner!

Hey Chip,
I have had just about every type of mat you can think of and I really do not think the mat makes much difference. I think you can prove this to yourself just going back and forth between your felt mat and no mat. Do use a record weight or clamp. I do hear a slight difference when certain types of record hold down systems are used such as vacuum hold down and the Walker/SME style system that uses a very thin shim at the spindle and a screw on record clamp that forces the record into the platter. I hear an improvement in mid bass definition. 
As far as just a mat goes the felt is fine. If you see one that looks better to you and makes your turntable nicer looking that is fine. The only thing I can think of against felt mats is that if you do not have a dust cover they will collect dust whereas other mats you can just wipe off. Don't fall for the ridiculous marketing claims that come with most mats.