I'd suggest you ask your instructor for advice.
He'll probably suggest you get yourself a set of Harry Mendohlson's specials - about £90 and do a decent job - When you've got your licence you'll probably buy a better set for yourself and the HM's will do for a passenger. You'll need a second set then anyway.
Right now, keep your money for lessons.
If money's no problem then fork out for the dave clark 13.4s - personally I prefer the Pilot noise reduction sets, for not much more.
I have massive compatability problems with my DC's (10.40's) so I'm getting a new headset, probably in-ear.
I've been experimenting with in ear foam plugs and find their noise attenuation to be excellent - much better than passive dave clarks with gel ear seals.
Whatever you get, check with your instructor first for compatibility - he will have your interests at heart.