I also have the Pak-O-Bird. It's a big investment, though, so it depends on if you take your bird out and about a lot (or want to). The other cheaper options here will probably work just fine for the purposes of a single trip.
Whatever carrier you use, I recommend let your bird acclimate to it for a bit before the trip, wander in and out when he's playing, and maybe take him out on shorter drives before hand to get a sense of how he handles it. You want him to see the carrier as something familiar, as his shelter from a new and possibly unwelcome experience, rather than as somewhere he's trapped that's part and parcel of the newness.
We did this prior to taking Foggy to the vet for the first time, and it went really smoothly--instead of having to fight him to get in the carrier when he was already upset by being handled by strangers and having blood taken, he scampered in there on his own to hide and sulk. If your bird gets loose in the car, you want him to WANT to get back in the carrier where it's safe.