Imagio on multiple networks?

[findrivr]

I get it; per this review [http://www.mobiletechreview.com/phones/HTC-Imagio.htm],

"The Imagio is a dual band digital CDMA phone with EV-DO Rev. A 3G for fast data and fallback to 1xRTT. It's also a quad band GSM world phone with 3G HSDPA for Europe and Asia, but the phone is SIM locked to Verizon (their SIM is included). That means you won't be able to use it on AT&T and T-Mobile in the US unless you get it unlocked. "

Now I need to decide whether to give up the multi-network build for the faster processor, larger screen & 'Sense' of the HTC-HD2? Is the out of contract price difference worth it ?