Jon:
The P/C question is one that only you can answer. Just remember that they are NOT all the same and you get what you pay for.
I will tell you that simply enlarging the ports doesn't always result in a linear improvement. Size isn't the whole picture; airflow is, and I've seen plenty of beautifully done heads that didn't flow very well on our bench.
Its FAR easier to ruin a set of heads with some well-meaning efforts using a die grinder than make real improvements and thats why I usually recommend buying & using factory SC (early) or Carrera ones.
Unless one has the budget to have them ported AND flowed, its not worth the efforts, IMHO of course.