There wont be much difference in distance but there might be a change in the flight. Cobra sets there Retail drivers very closed as in the case with the speed series (not sure on the actual *). Adams are easy to hit but I felt that what they gave in accuracy hurt way too much from distance. Launcher TI460 you would be going back about 3-4 Generations on Cleveland driver (since we are now at the HIBORE XL) so it might be a good bang for your buck on ebay. But Finally the SQ. The SQ's are retailing now just around $200. Exotic shafts wont change the price tag unless your getting a Ozix of course. They have a nice stock shaft that is a great combo with the head of the club. Might be the ultimate bang for your buck because if you let this thing swing itself man its going to take you places you would never think you could reach on the course before.
The way I look at it:
1)Nike SQ
2)Cleveland (just since its so cheap now)
3)Cobra
4)Adams (if you cant swing a club anymore this is for you!)