Hey
@OctoHelm awesome that you're getting into GUE so young.
I'm an active GUE/BAUE T1 diver. I took fundies and T1 with Beto and C1 with Mer. Both are fantastic instructors that I wouldn't hesitate to recommend to anyone.
You've gotten a lot of good advice in this thread and I would just like to add/clarify a few things since you're talking about my local area/club.
You definitely don't need doubles to enjoy diving in Monterey. Many people on the BAUE recreational level charters dive them, but that's mostly because it's nice to not have to switch tanks in-between dives. There are plenty of single tank divers as well. Doubles really aren't important until you start scooter/tech diving and it's a pretty easy skill to pick up if your bouyancy/propulsion skills are solid. I'd also like to clarify that literally no one I dive with dives AL80 doubles locally. When people say "80s" here they mean steel LP85s which are a very common choice. I would suggest using your drysuit in fundies. My drysuit was a critical part of me being happy diving here and you'll get a lot of good feedback.
With regards to doing T1 dives in Monterey: I love being tech certified because it gives me access to the deeper sites in the bay and South. The vis is typically better deep here, and you're insulated from the surface swell which is nice. However that said, helium is expensive and I can't imagine doing this kind of stuff regularly on a highschool/college student budget. A single day of T1-level boat diving costs roughly $300 (~$150 boat + $120 in trimix/deco gas + $40 in gasoline to drive from the Bay Area). That doesn't even include when you get scooter-envy and drop $8k on a brand new Genesis.
Take your time and just enjoy local diving before you go and make it complicated. Point Lobos and North Monastery are still two of my absolute favorite places to dive and have tons to explore at a Fundies level. (BTW
@rjack321 you can absolutely dive Monastery in doubles, I've done it a few times and my 55 year old dive buddy managed it just fine) The BAUE recreational charter boat trips are also a ticket to some awesome dive sites and are a great way to meet and dive with other GUE-trained buddies. I totally understand being end-goal focused, but don't forget to enjoy the time spent building experience.