I have owned 2 different OBS tahoes, both 99s and an 07 burb NNBS. I too am looking for a 3/4 ton burb or my unicorn, a 7.3 Excursion in good shape (I know, blasphemy).
If you are looking for 3/4 burb, Price and options are key. Here is my line of thinking and how I am looking for a 3/4...