recording elec. guitar with soft emulations

There was a post on this same subject in the "software" thread I think. There was Youtube video showing a shootout between TH2 and Guitar Rig. They were very similar But to my ears TH2 had a little more mid to high range bite, whereas Guitar Rig had more bottom end grunt. Having said that you could probably just change the patches to suit your requirements. Not sure about latency issues, better minds than mine to answer that one I think.

     I'll sometimes use a direct box to send a clean signal to Sonar and also to a real amp.
 This way you can hear the amp while tracking to ellimanate any latency problem but still record a clean signal to use with the amp sim.
     That being said, with other latency causing plugins frozen or disabled you should be able to monitor through the amp sim without any problem. 
   

You can't get to 0 latency if you're playing through the amp sim in real time, but a few milliseconds should be low enough.  The recommendation of playing direct, monitor through a stompbox, but record the direct signal is good.  The trick when recording direct (with or without an amp sim) is to have the correct impedance.  Guitars are high impedance, so you want to plug into an interface that is designed for it.
 
The TH2 amp sim is good.  I can't recall if X1 came with Guitar Rig.  I use Guitar Rig (full version).  The lite version that came with SONAR for a while has a model of a Fender Twin Reverb.  That works great for Strat sounds.
 
Jim