Looking for a good Tx for racing inside on road electric

You can't go wrong with any of the big names.

Check out the new spektrum dx6r

Agreed, & you should also consider what your budget is, there are PLENTY of really good raceable transmitters that WON'T break the bank, but in the end, the most important thing is how the radio feels to YOU, the racer, & everyone has different tastes. What feels good to some will feel like junk to others. Best thing I'd suggest is to see if you can find people who use the ones you're considering, & see if they'll let you get a feel for them in your hands, look through their menu systems, etc., see which ones make the most sense to you....