OP seems to be at a pretty good point, for an early-stage overhaul, so hopefully doesn't mind a bit of drift...
Of the recent class of chargers, this style is one of my favourites:
CTEK Multi US 3300 | CTEK Battery ChargersCTEK Battery Chargers
Ctek 3300, in the North American listing if that url doesn't fire up....
Relatively small case (easy to fit into nooks/crannies), with good maximum output relative to case size. The case is well sealed (IP rated), so can handle rough weather, or on vehicle mounting.
It has a cold weather mode (alternators are temperature compensated to bump up charge voltage, as temperature drops), which is also a good match for charging AGM batteries. I've bought one of these, the next time I catch a good sale, I'll probably buy another I like it that much.
Bosch and one other manuf. I can't recall at the moment have similar types of products.
Rgds, D.