I finally got my hands on a decent ALPS board & a good ole" Model M! 
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Dude, congrats! You'll have a lot of fun with those boards.
The Dell's a real solid model. Lots of us like how it looks, too—and the unusual fact that it has Windows keys despite being a vintage mechanical. Not everyone is big on vintage Alps Blacks, but I like them fine myself, especially when they're in good shape (not highly worn).
It's up to you if you want to go to the trouble to open them, which can require some delicacy and patience. If you're basically happy with how they feel, you can just remove the keys and wipe a bit of lube around the visible part of the sliders; I've found that sped up even some Blacks that weren't working as well as yours.
Just be sure to use a lube that doesn't react with plastic (i.e. isn't petroleum-based). If you don't have one of the specialized lubes people go on about here, I've found
this INOX power-tool lube is great for keebs. I just spray a bit in the cap and dab it with a Q-Tip. It's plastic-safe—in fact, it's so pure, it's considered food-safe (though it probably doesn't taste very good, LOL). It's a lot easier to find, too, at least here in Canada, where you can get it at hardware stores—maybe in the States too.
That said, AT101/101W's are great candidates for switch replacement too, if you decide to go in that direction.
Nothing can be said about your Model M that hasn't been said here many times. That big ol' beast should serve you well, not to mention driving anyone else you live with crazy. :?) You did a swell job cleaning it—but for what it's worth, should you ever get more, you may find that compressed air blows out debris much quicker and easier than trying to wipe it out of the barrel plate's nooks 'n' crannies.
It sounds like you got yourself a raft of fun keys for it, too. Feel free to post some photos when it's ready to go!
