What is the best USB/firewire interface for under 150. can be used too....

Honestly, you're not going to find a whole lot at that price.

I'm not being snobby at all here, but I haven't actually used something that cheap, so I really have no idea what kind of quality you can expect, but I was able to find these.

Personally, these look like the best deal for someone starting out as they comes with software as well:
http://www.sweetwater.com/store/detail/Lambda/
http://www.sweetwater.com/store/detail/MobilePre/
http://www.sweetwater.com/store/detail/0202USB/

That said it doesn't look like they come w/ any MIDI I/O, so if you're planning on doing any MIDI work those won't help you.

These have audio & MIDI:

http://www.sweetwater.com/store/detail/UA4FX/
http://www.sweetwater.com/store/detail/US122L/

Honestly, you'll probably be a lot happier if you can try to save up another hundred or so, if possible and get something one step up. You'll get a lot more for your money - but, if you absolutely need something now, those will probably work well enough.

Podcast Factory
Complete Professional Podcasting Package
USD 179.95

MobilePre USB
USB Bus-Powered Preamp and Audio Interface
USD 179.95

Fast Track Pro
4 x 4 Mobile USB Audio/MIDI Interface with Preamps
USD 199.95


Phonic
FireFly 302 Firewire Audio Interface

The Phonic FireFly 302 Portable FireWire unit is an easy-to-use, high-quality interface for songwriters to record guitars, keyboards, ...
Our Low Price: $129.99