Depends a lot on your budget. I have a Fuel stainless oval can which I got in one of their sales with 30% off so it was a bit of a bargain. It's well made has a lifetime warranty and isn't too obnoxious with the baffle removed. I was also looking at MTC at the time as they were also recommend along with Fuel but the 30% off swung it for me. My bike is Ivanised (Full Monty) and runs better with the baffle out (134bhp) than with it in (127bhp) so having a longer quieter can is a better option than a stubby louder one if you want the best performance but noise is an issue.
Keep an eye on the For Sale and Wanted section as decent cans often crop up on there.
Keep an eye on the For Sale and Wanted section as decent cans often crop up on there.