I have owned a good handful of Browning Citori based guns (older and 3xx, 4xx, and 5xx series) and find them to be a bit heavy for an upland gun, especially so in 12g. The primary weight seems to be the heavy walled barrels.

I've found that I prefer Beretta barrels now. The 687 Ultra Light Delux would by my pick over the other two in 12ga. It is an aluminum alloy frame but has a titanium insert in the breachface. But, I'd prefer a smaller bore like the 20ga. That might bring the alloy frame Tiempo into the mix.