I believe John is correct about the SDI options for Avid, the mojo is the only interface I know of as well. The “nice” thing about the mojo’s these days is that Avid will overnight you a new one if you do encounter a problem. You just have to be able to convince them that the problem is mojo specific and not a compatibility issue with other gear.
As for FW drives, if you’re looking to go cheap, go cheap enough to buy two of the same ones so you can actively back-up and swap drives in case of failure. The cheapest drives I’ve found are the LA Cie refurbished drives, but I use them for transfer only and don’t work off of them. G-Tech’s G-Raid drives are extremely reliable, but more expensive.
Are you looking for HD or SD monitors? Try local post houses or rental companies and see if they have any older models they will off-load. Sony LUMA LCD series has some cost effective, smaller models. Wouldn’t recommend for on-line, but they do the trick for off-line.