I'm planning on buying an interface, and I remain undecided on which of these 3 to buy. They cost about the same.

Line6 UX2
E-mu 0404
M-Audio Fast Track Pro

Also, will I be able to hear the guitar with effects applied in the PC thru the interface's headphone jack, or just thru the outs?

Finally, one final question, if you can: What is S/PDIF?
SPDIF allows you to connect another SPDIF compatible interface up to give you an extra two inputs usually.

Those products are much of a likeness. Faced with a choice I'd choose the Fast Track Pro. Why? Because it supports Pro tools M-Powered and Pro Tools pretty much the best sequencer out there.
on musiciansfriend theres a lot of terrible reviews but it seems like the best buy.. these are the interfaces im looking at too
Epiphone Les Paul Special II
Ibanez Rg350m YE
Roland Cube 80X
Squier Acoustic << AWESOME
I was looking at the Fast Track Pro too, but I've ended up getting a Tascam US-144 MkII, since it seems it's the best USB interface on a budget. But I haven't tried it yet, I'll have it next week.
- Fender American Standard Ash Telecaster w/ DiMarzio Chopper T & Twang King
- Alhambra 5P
- Laney Lionheart L5T-112
- Line 6 POD XT
- Suhr Shiba Drive
- MXR Carbon Copy Analog Delay
- Dunlop Cry Baby
Get the Fast Track. Don't listen to the reviews, its worth it.

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