A high end choice sirloin is going to be much nicer than a low end select sirloin. Most of the stuff you see in decent steak houses is going to be at the high end of choice or better grade.
This is why you can sometimes find a great sirloin in a steak house. The stuff you find in your average grocery store is going to be select with hardly any marbling.
Maybe places like Costco, Sam's Club, or high end grocers/meat markets will have better quality sirloins.
Modded Brinkmann Gourmet. Basic UDS. Rescued 22.5" OTS. SJS Mini-WSM. Stubbs. B&B Oak Lump.
Cannondale 2009 F8 (for burning off all the great BBQ)