I have 3 transmitters, none of which I consider perfect. I guess I will just have to fork over the $$ for an EDM unit someday.
1) A modded Belkin which I used for two years with good results.
2) A 1W/5W switchable unit purchased off eBay. Obviously non-compliant, but wow, the sound is crystal clear. However, even at 1W and with lots of obstructions (houses), it will transmit more than a mile, which is way too far in my case.
3) A Vastelec FM02 which I run with the ground-plane antenna that came with the eBay unit. Sound quality is better than the Belkin, but nothing close to the eBay unit.
I've run Breakaway with all of these, and I highly recommend it.
Matt