If you want heads that aren't full-blown CNC jobs, I also give Dwayne Porter kudos for all the work he's done for me in the past.

For the CNC'd stuff (definitely more expensive), Hughes CNC'd Victors are worth looking into. I haven't gotten my engine running w/ them, yet, but all indications are they should make good power. Search back a couple of years for my posts on mine tested on other flow benches to see some unbiased numbers.