I was going to suggest the Cobra F9 as it is a great driver IMO. However, he'd have to get a used one as TGW doesn't have any new left in stock. Which isn't necessarily a problem, but he'd have to throw in more money than what his gift certificate is worth.
What shafts do you play in your irons and woods now? What's your ball flight?
I just ordered the F9 driver from Cobra Direct with a custom shaft for 249. I think their generic is the Hazardous Smoke 6.0 which is pretty solid. if you are generally a Dynamic Gold S300 or PX 6.0 (ie: stiff flex low launch) profile kind of guy it may do you right. I could easily play that set-up.
I ended up doing a casual but educated fitting and picked the Even Flow White shaft in a 6.0 because its a low launching low spinning combo that worked on the Trackman.