I agree that a solid foundation of strength should be built before one gets "too specific" in their training. That most often leads nowhere.
Assuming you take that to heart and get some commendable strength in your legs, here are a few I cycle into my bodybuilding routine which also help my hockey legs. They're somewhat uncommon depending who you talk to, but believe me they will work wonders for core strength and stability. I know plenty of guys who can outsquat me easily, but can't touch me on these. Then again, half of it is training the movement so that's no surprise. I used to be a squat-for-numbers nut too, but not anymore. But I digress...
Here are a few to look into:
- Bulgarian Squat (lots of people do these with light weights and never really push themselves. Start light, yes, but do push yourself when the time comes. It's as tough of a stability movement as it is for your legs, many overlook that and just worry about their legs)
- Walking lunges (DB or BB, just get a full extension)
- RDL with STRONG focus on your hamstrings (it's so easy to cheat on these and use your back, but correctly done they will kill your hams)
- Pistols (I like to do these after a few sets of plyo squats/jumping split squats, lunges. They look simple but are HARD. Last guy who wanted to show me he could do them made it about halfway on rep #1 and fell on his ass)
- GHR (glute-ham raise) if you have the means. Killer hamstring move, quite off the wall, but it WORKS.
- HIIT biking (I use the machine, just make the high intensity interval as hard as you can get away with. These are brutal when done right)