There isn't that much difference in heads now days. They can't exceed a CORE of 0.83 or get any bigger than 460 cc's. The big difference comes in the shaft. This is where it is important to find out what degree driver loft and flex of shaft work best for YOUR swing. A launch monitor with a KNOWLEDGABLE tech would be very illuminating for you, oh btw that would not be Dick's, GG or GS cuz from what I've seen, they don't know much.
Now I see you are hitting your driver 250-260. Whats wrong with that? That is longer than most ppl. However, its not necessarilly about distance, its about accuracy. A 300 yd drive in the rough or OB mite impress your friends, but it will kill your score. The longer the drive the more possible trouble you will find. Heck, if I want I can rip it 280, (which isn't bad for a 63 y o guy), but I loose accuracy, so I'm happy with 260 in the fairway and I still make it home in 2 on most par 5's b/c I love my 12.5* 3 wood.