Unless you're really anal about your gear.......like me (I shoot the Pro's)

Buy the XT's but here's why: If you take each shaft and cut evenly from BOTH ENDS to reach your desired length shaft you will eliminate most of the "runout" on the ends where the straightness deviation lies.
Remember these are all the same shafts it's just that the Pros grade out better over the full length shaft blank.
If you cut evenly from both ends you can make the XT's very close to the specs of the pros by removing the "bad parts".

Buy the Xt's and either do it yourself or INSIST that your pro-shop cut from both ends to get you your usable shaft length.
Then you can feel like you got your Pros and saved enough $$$ to buy some new broadheads.
(You can also feel like you got one over on the man.)