Yeah, plenty of options. Just make sure the controller is up to date — newer PS2 boards should support key combinations with right flag keys (CTRL, SHIFT, ALT), but old don't. At least my Model M ('93 Lexmark) doesn't support them via USB converter (it doesn't work through modern PS2, probably because it hogs too much juice). Something like SHIFT+CTRL+HOME isn't important to a gamer but the lack of it makes the life of a typist miserable. You also need to test every single key because contrary to all those 10–20M keystroke ratings, individual keys on mech boards at a rate of 1–2 keys per board give out more easily. If you can solder, it doesn't matter, but if you can't and nobody can help you with it, then you're in trouble. Watch for stuck contacts too, e.g. repeating full stops (.. instead of .). Even a sturdy Model M may begin to show it after 20 years of use.
Once you inevitably start collecting old boards, make sure you don't fritter away your money on shipment costs. It's easy to overlook shipment costs as accidentals and only focus on the actual price as the amount that matters, but whether product price or shipment fee, a twenty is a twenty and a fifty is a fifty all the same. So make sure you calculate your purchasing power with allowance for shipment costs, not without.
