I'm 6'2"... Which is problem enough. I definitely wanted to have standing headroom in my search. Also remember at the boat shows you are taller with your shoes on
Production boats here are probably where you will find the headroom with your budget.
In your size range I was particularly impressed by the headroom on the beneteau 373. Due to your location, you may be able to pick one of these up ex-charter within your price range. (if you are willing to get an ex charter). The older 362 is also roomy, but not as huge as the 373.
I am not a big fan of hunter, but they have also been following the voluminous airy cabin trend, their 38 has a huge amount of headroom too. Probably a used one in your price range.
If you are willing to go multi, consider a used Gemini 105. Can't find the precise headroom, but I think in the house it will be decent. Here's a comparison of 373 vs. 105 : http://www.geminicatamarans.com/PDF/SAIL_Mag_1_04.pdf