ok.. IMHO i think your main options are as follows
1. Get something like
Amazon.com: Hosa Cable GPR101 RCA To 1/4 Inch TS Adaptor - 2 Pack: Musical Instruments
so you can plug your guitar right into the Behringer and use amp sims. Google LePou and acmebargig and you'll find good stuff. There is a lot out there.. Im hearing great stuff about
S-Gear for less than extreme
high gain stuff. 15 day demo
S-Gear
2. You can try to get a clean signal (clean as possible no dist or eq) from the amp to your DAW and see how these amp sims sound. I think the signal will have some pre-amp color to it and it may not really work well with the amp sims. Generally the amp sims just need the sound from the guitar.. some folks put pedals in front so it might work out.
3. you can record the distorted sound from your amp but you need a cabinet simulator to put on your audio track. You can demo recabinet (google it) and see how well that idea works.. for free you can google cabinet impulse files and get some good impulses. I believe there are some you can search
the REAPER forums for and load the impulse files into reaverb (in reaper) and that will act as the cabinet simulation..
4. you can spend a bit of cash and get something from
the line6 pod or similar setup... where an external box does the amp/cab/room/mic modeling.
5. you could build some kind of guitar fort that encloses you amp so you can mic it
In order to use the amp sims in my opinion, you have to have a pretty speedy PC. I have an old core 2 duo box and no matter how much i tweak settings, I cant play/record it in real time without some noticable latency with pretty much any amp sim.
There is kind of 2 camps here.. those who want to record a DI signal so they can fiddle with the amps and tones during mixing and those who want to record the tone during tracking. There is some tricky ways to do both at the same time usually.
For me... I generally prefer to commit to the basic tone (amp) before tracking.. you have to commit to it sometime. The only thing I generally don't record is time based
effects (delay reverb, modulators) because you can't smoothly punch in record if your printing the fx.
So at least for now, I'm using a Pod HD unit to do guitar tones.