think are the most important to replace first? Putter & driver? Or irons/wedges.

My current clubs are a hodge podge of old clone irons/wedges, a 50 degree Cleveland wedge I found, a 2013 Cobra AMP driver and 3W I bought on eBay.

This year I can either do driver & putter or irons since my budget is $600 per year. Then next year I'll replace whatever I didn't this year.

I'm planning on getting fitted at the PGA Superstore and then hopefully buying clubs that are brand new but last season's models to save money.