if u do not need draw bias then u can easily experiment.If u generally tend to hook the ball then u should go with FT-5,Nike and cobra are not that good as they do not give you the feel trying taylormade burner is a very good idea the R7 was not such a great driver having owned one myself i am saying that.Ping drivers do not give you the immense top spin and feel that you get from callaway and taylormade drivers Mizuno was never a great with its drivers if u r planning to buy irons only then u should go with mizuno.Diablo has got a slightly closed club head so it will promote a draw so do not take it.Go with FT-5 in my opinion otherwise u can always try the r7 limited golf driver that is nice but do not go with the simple r7.
You can check the r7limited at the following link.

http://www.globalgolf.com/promos/clearance/-/pg--1/ptmj--4/ptid--1/driver-clearance-golf-clubs.aspx?&gd=2