So I have a classic Rodriguez steel frame that I'm slowly converting to something slightly more modern. It started in 1984 with down tube shifters, and then I wasn't sure whether 700c would take off in USA so I hedged and got 27 wheels, but the cantilever brakes are mid position so I can switch to 700c without issue.

I've updated my Mavic aero brake levers to something lots more comfortable from Tectro. I had my rear derailleur switched to a Shimano Deore XT from the old Duopar Eco. I've switched to Shimano bar ends.I am still running an Avocet triple up front with a 24 tooth hill climber. I think my big gear is 48, but honestly I spend most of my hours in the middle. I don't remember anymore.

Now it's time for the new rear wheel in 700c, quick release and rim brakes, obviously being retained. I believe I've done what I need to (possibly barring spacing in the rear cold set, but I'm going to start without) switch to 700c with maybe 130mm Shimano 105 hubs with 11 or 12-34 or 36 teeth on a hyperglide (my current low is 34 teeth with no chain wrap issues). I'm looking for reasonably priced wheels and advice about 9 vs 11 and what else should I watch out for? I wouldn't hate switching to tubeless, I think, but tech has changed so much since I last went to pick components that I'm a little overwhelmed by all the compatibility issues and sizes to be thinking about. I believe my derailleur is from the mountain bike line. Will that be an issue with the new wheel and cassette?

Seeking advice, sources, and guidance? I have no experience building my own wheels or I would be tempted to just get it done myself.