Advice on my hypothetical setup

[Bighead Kid]

So my 4 piece band (bass,tenor,guitar,drums) has decided to spring on some recording equipment
We already have 2 good mics(couldn't tell you the brand name but they sound fine when i've mic'd my amp before) and a macbook pro
This is my proposed setup:
Everything goes to garageband through
http://www.musiciansfriend.com/product/Tascam-US1641-10channel-AudioMIDI-USB-2.0-Computer-Interface?sku=245002
guitar is di'd
tenor is mic'd
drums are mic'd by these
http://www.musiciansfriend.com/product/CAD-4Piece-Drum-Microphone-Pack?sku=270777

Any suggestions?
We just need demos, not super high quality cd's.
We don't want to spend more then what i linked to.

 

[stranger0]

So you're looking for an interface or a way to create the demo?

 

[Bighead Kid]

I'm looking for a budget recording setup and I figured that interface was my best option and I wanted some advice.