SCU, OldBogey, 2Putts, cerebr_al, SteveH115 and Robroy22, appreciate the comments and the help.
I'll do the lot and nut this out. My irons are the best part of my game (driving okay, putting terrible), so a good set will only enhance that. Last week I had an 84 with 41 putts which is horrid so there's plenty to work on but a good set of irons that fit me will do wonders as I'm 6'4" and using standard small irons/hunched over.
I'm sure going from no lessons and playing once a month to lessons and playing a couple of times a week (which I plan to do from now on), I'll get my handicap right down so it's only worth to do the lot. Demo nights, testing clubs and I think I'll do see Jon at TGP as he's closer to me and get him to fit all clubs., especially taking a look at the putter.
If you decide you want to go with Titleist, make sure you book into the Titleist Regional Fitting Centre which is next door to Spring Valley. They have every different head and shaft combination you could think of and Cory the fitter is just fantastic. A great experience. You will need to book in several weeks/months in advance and it does cost $75 but it is well worth it.