You can use Impulse Responses in place of cabinet sims on modellers to get even better and more responsive tones. Here is my tutorial on how to do it with Reaper as your DAW.
I use Reaper as a DAW and Voxengo Boogex as an IR host.
Read this to learn how to do this: http://www.guitarampmodeling.com/viewtopic.php?t=2452&f=32
Free Redwirez IR: http://www.redwirez.com/bigbox.jsp#Marshall1960A-G12Ms
More free IR's: http://bedroomproducersblog.com/2010/10/01/free-sample-shootout-6-best-free-guitar-cabinet-impulse-responses/
http://www.guitarampmodeling.com/viewtopic.php?f=32&t=2631
http://www.guitarampmodeling.com/viewtopic.php?f=32&t=17676