None, IMHO, or any that you like.
At level 30, there aren't any good drivers available, and as an Amateur, you may well do without it.
Level up without buying anything as long as you can, then buy the best you can afford.
I am a Tour Pro and still do well with only the lvl 47 Rapture 3WD, outdriving many lvl 30 drivers, at 1/3 the costs.
One or two wedges may improve your game. Others suggest the lvl38+ ZSatin series (I have one, very nice).
And maybe a ball, e.g. the WTG tour-SD balls, if you don't mind the steady expenses.