But I am now wanting to have the ability to mix a matrix of SBD + AT-831's and record to SD or CF on the spot. I was looking into the Tascam DP-004 or the DP-02CF. Only problem is I do not think this is going to work for what I am wanting to do. I need the ability to plug my mics in as well as the SBD. I have been reading and see that these only allow for 2 tracks to be recorded at one time. So this would be great had I only been working a soundboard recording but I am wanting to mix on the spot.
Are you looking to record genuine 4-channel, or mix down the matrix on the fly and record 2-track?!
For two track, the obvious answer within the $250 budget is:
digimod UA-5 ($115)>iriver H1xx ($135)A four track recording rig under $250 is tricky. Since you mention the bulky tascam gear, I assume you don't mind open taping, or even AC powering?!
Your best bet would be to pick up a four track sound card ($150) and pair it up with some old el cheapo laptop second hand ($100). I doubt that you will find one with sufficient battery life though, so you'd probably have to power it AC from the soundboard.
If you go that way there are several options. I don't have first hand experience, but you should take a look at:
Presonus Inspire 1394
Tapco Link Firewire 4x6
EMU 0404 USB
Lexicon Lambda
Yamaha Audiogram 6
etc... (there are better sound cards out there, but these are all in the $150 range)