IAH is very unfriendly to GA. I'd rule it out off the bat.

That is TOTALLY not true. I find IAH very easy to deal with.

Garett Aviation is very friendly to light airplanes, and the
controllers are very easy to deal with. You simply need to be able to
ask for what you want, and comply. Always ask for 15R/33L. It keeps
you out of the way of the big boys, and Garrett is just off the
parallel taxiway (WC).

Michael