First off, I don't know how you swing. (in terms of club head speed, etc.)
My club head speed is way down from where it was 5-6 years ago. A combination of not enough play, out of shape, yadda yadda. But I can still hit my 3 wood about 250 or more, so I don't worry much if it's in the fairway. I also tend to get a lot of loft, which increases distance, especially with the newer ball designs. I used to hit my old Taylor Made 9.5 about 290 or so. Now I have a new Callaway, and just can't get it around fast enough. (That alone can cause a slice)
Since you slice, I would suggest that you first concentrate on your stance. You might just be too far from the ball at address.
Practice with your 6 iron, then advance through to the 5-wood, 3-wood.
I'd not waste the money on a driver until your club head speed is analyzed, as well as your address. The best club to use is the one that gets you in the fairway
