What battery(s) I should get, and charge?

Hi to all, Ive been reading thru old threads on what battery's I should be buying and have become a bit bamboozled by it all.
At the moment I have (cant recall) starter battery which isn't very old, A MRV70 battery for winching/fridge/aux, which is 5 years old and no longer holds charge and due for replacement, and lastly, a deep cycle battery (sdc something)that came in the van I just purchased which also doesn't seem hold charge either, age unknown.

Question is, what should I be replacing them with?
The aux battery will be under bonnet on the Turbo side (105 cruiser), the other battery will be in the van, plan being when the van not in use, be plugged into a power source and charging via a smart charger(what type?).
I also have 120w solar panels for use when away to help top up battery's.

I'm reading conflicting info with regards to putting AGM's under the bonnet which is why I'm unsure about their suitability, but seem to be the logical choice for the van.
looking forward to more sensory inundation :)

Shane
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