Sidroe
I use the Audiffex GK Amplification PRO plug. There is a free version that is very powerful. If you can't make some serious noise with this one I don't know what to say. I liked it so much I bought the full version. It's a full blown model of three of the most popular Gallien Krueger heads with all the cabs simulated as well so you can custom build your own rigs from the ground up. Also, a large library of mics to choose from. Very useable as well as affordable. The free version will probably win you over.
Hey Sidroe: Where did you find the free version of the GK plug?
I happen to like the tone of the GK products a lot. I visit the audiffex GK site often hoping for a sale, but never see it. Their GK amplification line (pro and standard) sounds really nice for a vst. I have a real GK 210 combo that I use with a Trace Elliot 115 bottom that sounds great--clear, tight, crisp, punch, but big full bottom. I like the GK vst better demo than the Mark Studio one, but that is just my opinion==not right, just what works best for me. However, I am just fooling around with GK demo; I have not seen a free vst from them.
Can you point us in the direction of their free GK vst?