Re: the garage, you'll want at least a 9ft door if using a single bay entry. So many builders in DFW use 8ft doors it is ridiculous. Even if you fold your mirrors in, you are operating w/very little room for error.
Also consider running a sidewalk from the front of the house to the back, particularly if your garages aren't on the back of the house. It makes it hella easy to move things to the back porch, and you can put your trash cans there if you don't want them in the garage.
I haven't seen it stressed that you should add a recirculating hot water system. Once you've had instant hot water (within 2 seconds of turning on a faucet), it's hard to go back.
In addition to a gas line for a grill, also consider if you want gas lanterns in front of the house. Now's the easiest time to add those gas lines, even if you don't put a lantern up until later.
Anywhere you think you might put a tv, run power to that location on the wall and consider a conduit at the base of the wall to run lines to satellite, blu-ray player, etc. You can always put art over the outlet if you don't put a tv up.
Make sure you have cable/power on your patio. Run extra outlets outside of the home - if you don't do landscape lighting on day 1 it's a lot easier if there's already an outlet to put the junction box once you do add lighting.
We're building again now. We've gone through most of the budget doing structural changes. Fortunately its a 1 story home so I can skimp on some of the "nice to haves" such as speakers in the ceiling in every room. I can always add those later. The critical thing is to make sure I have the appropriate amount of conduit run to my interior closet that will house all electronic equipment.
Staff - take out the trash.