It's floor mats. Others may differ, but I think that if you're exclusively playing vinyl your rig is perfectly matched to your system. I had the same issue, started out with a Rega P5 TT into my HT system (Yamaha RX 2250 or something like that). The TT sounded great! I invested $450 in a used phonostage and I could tell the difference. It was better, but the angels didn't weep or anything.
That said, if you want to pick up a tube preamp to have some more fun, go for it!
That said, if you want to pick up a tube preamp to have some more fun, go for it!