I know you said you were looking for new, but I would really suggest finding original controls for the modular panels. For a general 4-way, the Wico leaf switch stick is great. They can still be found on ebay or put up a wanted post here or at KLOV. I really don't think you can beat that stick.
I think crazy climber used 8-way wicos, but I am not sure.
IF the game is important to you, get the real thing. I have Ikari Warriors sticks waiting to be mounted on panels, and yes, you will need an interface for those. I see pairs of these sticks selling for about $50 pretty regularly.
For an all purpose spinner, one of the new ones from Ultimarc or GGG would be pretty good. I am using an old oscar spinner, but I also bought Tron, Tempest, and Arkanoid spinners to mount on panels (I REALLY need to start making panels again.

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I currently have way too much stuff, but if I had it to do over again, I would start out with:
Wico 4-way leaf
2 Wico 8-way leafs
2 Competition sticks (if you like fighters)
aftermarket spinner
Happ 3" Trackball
That will cover most of the games. You can specialize after that if you decide that you don't one of those sticks on a particular game. The first addition for me would be a real Donkey Kong stick. For you, I would suggest the LS-30 sticks (Ikari Warriors), since that is important to you. Defender and Moon Patrol are both best with a real Williams stick, but you would need 2 of them so you have vertical and horizontal. I would spend the money for Defender since it works so much better with the reverse button. Honestly, the wico 4-way is probably fine for moon patrol.
If you never buy anything else, you can be perfectly happy, or you can go as wild as you want (or can afford). Getting into wheels and yokes is fun. I have Star Wars, Roadblasters, and Spy Hunter yokes waiting and I really hope I get them mounted this summer.
I bought cheap when I started, and I have replaced a lot of them with better condition controls. I think it is worth it to spend more for a good one unless you have the time and ability to fix them.
Have fun with it. I bought my first cabinet for MAME 8 years ago, and have been enjoying it ever since. I am in the process of a new redesign that will use an LCD TV, which I am looking forward to. I now have 14 of the games in my garage...mostly the ones that I bought dedicated controls for...Donkey Kong, Gyruss, Defender, Tempest, Moon Patrol. It is a weird hobby! With modular, you can recreate the exact controls of the originals, and I think that makes the games way more fun to play. Please post about your progress as you move forward.