Before you go and spend money on another machine, have you thought about getting cutting software for your Cricut? I have Make the Cut (MTC) software and I love it! I can use any SVG files and my cricut cartridges. Here is where I bought it:
http://designingwithdiecuts.com/
They have a free trial version so you can play with it before buying it. It is on sale for $58.36 plus you get 6 free cutting files for purchasing it from them. Here's the details on that too:
http://designingwithdiecuts.com/lear...ing-spree.html
There is also a free software available called Inkscape (use version 0.46) that is used to covert your GDS files from your Silhouette to SVG for your Cricut. Here is a link for that:
http://www.pennyduncancreations.com/
Also, I have instructions from a yahoo group that I belong to for MTC that has directions on how to back up your Cricut cartridges so you can use them with MTC. If you are interested in that, please PM me and I will send it to you. You will also need to buy Cricut's Design Studio software to do it but I bought mine on Ebay for $17 with free shipping.
So, to summarize, for about $80 in two different software packages (plus the free Inkscape), you will be able to use all your GDS from your Silhouette and all your cartridges without having to buy and learn a new digital cutter.
If you have any more questions about MTC & Cricut, please feel free to PM me!