i can give you a good perspective on this as i more or less did the same.
i started windsurfing in the 70s, aged 13 or so, and grew up on hayling when it was the mecca. began with windsurfer regatta, teak boom etc, got into wave sailing as that came along, ended up mid 90s traveling on the world tour making tv shows and had some pretty fancy kit. then i simply stopped.
3 or so years back i got an email from my old sailing mate, he’d been a pro in the day, saying he had got a bit of kit together, that i would be stunned how good modern stuff was, and was i in.
think i may have even posted a thread on here, but long and short after a bit of reading up i listened to combined wisdom and ignored the stupid cheap 90s kit you can get and bought, still silly cheap, a JP freewave 84 and a couple of naish sails. all up maybe 400quid. i can remember looking at the jp and could not believe how small it seemed.
i now have 3x north heros (about 125-175 each) and a JP wave 82 (350quid) and recently a naish koncept (125quid) for lighter winds that i’ve yet to sail.
there is no question that newer stuff, i reckon 2008 is the cut off 2010 on ideal, is so far ahead of older kit is crazy. there is a much wider windrange and its just a damn sight easier to sail.
i did buy last summer a mistral flow, from mark gohegan who i’ve bought a few bits off, immaculate for 35quid, and it was super fun and allowed me to sail in pretty light winds but i was amazed at how different it was to the newer kit i had sailed.
my advice if you want to get back into sailing is buy cheap at first, but don’t buy old no matter what sort of bargain it seems.
if you are not fussed about planing then just get, like has been said, something like a kona 1 and a 5.3m sail. or better yet a windsurfer regatta, i still sail mine in the summer.
i’ve got a well used but sound and light f2 lightening that i would sell silly cheap if you really want one, but i’m in cornwall.