All,
Thank you all for the speedy replies.
I had read about the possibility of marrying under the ETSA, but aside from the challenges faced at the border, though, I have ample evidence of my ties to the UK; my biggest concern is that if there was a change in circumstances, we were to change our plans and look at moving to the States sooner, having getting married on ETSA could present some problems when applying for the relevant Visa.
Longer term, the CR1/IR1 visas certainly sound worth consideration.
Thanks again for all the help.