I don't think...
I don't think you'll see LTE in another Nexus phone until Verizon unties their 3G service from it. There is no such thing as an "unlocked" LTE smartphone because of this.
For me, HSPA+ is fine. I was considering Republic Wireless for a while, but now I'm learning towards going with the Nexus 4 on T-Mobile's $30/month 100 minutes / unlimited text / unlimited data.