does the indigo have inputs? i'm not sure it does.
ok, if you're only taping from the soundboard, just get a device that has an a/d converter in it, you do not need mic pres. the vxpocket will work but still the a/d is being performed by the card which is inserted into the laptop, and is not ideal because of the interference that can be introduced by the surrounding electronics. also, on the same thought process here, do not use the inputs on your laptop, the a/d will be crap. you want an external device to do your a/d conversion for you.
the ua-5 is a good option, you can also try an egosys u24 (or u2a if you can find it used) or the emagic devices, they used to be called 2|6 and 6|2 but the names are slightly different now. all of these connect via usb and have analog inputs and do the a/d conversion outside of your laptop. the quality of the a/d may not be the best but it will be better than whatever soundcard is inherent in your laptop. these devices typically run under the $200 mark.