If you are planning on recording direct to the PC, you can do this via the USB port on the AxeFX...you don't need an interface at all in this scenario (the axefx IS your interface)...all you'd need is some recording software like Cubase, sonar, or one of my favorites is Reaper...it's only $60 for a full license and it's great! If it were me, I'd get Reaper, a decent used soundcard off ebay(something by a music company, like M-audio, or RME), and some good monitors. This will get you started and should provide a great base for and future needs.
Just as an example, a good used set of Mackie HR824 monitors is about $500-$600, add another $100-$200 for a decent soundcard, and $60 for Reaper and you're in there. I really love the Mackie HR824's...very nice monitors, new they retail for around $1,500, but you can find them used for 500-600...just a thought!
Brian