Nice pull, WB.

My input based on what I've worn:
Chota Abrams Creek - great entry level boot, but won't stand up to a season of bushwacking and aren't sturdy enough for hiking while loaded down with gear.
Cloudveil 8X - I actually never owned them, but had friends who owned them and said they liked them, but they went out of biz, so who cares
Simms Freestone - pieces of shit
Simms Headwaters - My first real bluelining boot. Good lightweight boot, but you'd get a year at best....at best. But simms does have a good return policy, and I still keep my second free pair around for light duty trips.
Simms Rivershed Boots - Perfect blend of lightweight yet still sturdy. I wear mine in the winter as well as summer and they do the job. Definitely my recommendation and plan on buying another pair when the current ones are ready for retirement. I even wore them as my hiking boots on a 4 day backpacking/fishing trip last year.
Simms Guide Boots - Good and rugged, but too heavy.
I have not tried the G4s, but from what I've seen in the stores, they seem a little bit of overkill for bluelining and may also be on the heavy side. Simms also has a RiverTek BOA boot that looks lightweight and simple, but I've only ever seen them online and my fear is that they won't be able to stand up to the abuse.
Also, I am a proponent of the rubber soles with a combination of star cleats and studs. The only problem is that the lugs wear out and the nearest place to get them resoled is Georgia or New York, I think. I almost think that I am just going to buy new boots once the soles wear out, even if the uppers are still good (which should take ~2 years or possibly less).