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Individual chargers is a better option. It takes care of any balancing issues your pack might have (on the charging side at least).
You do not want to use battery chargers in parallel. No matter what, one will always put out a slighly higher voltage than the other and that just causes problems.
If you are buying a charger, get one designed (or programmed) for flooded lead acid, not lithium, and not even AGM or gel. The charge profiles are similar but voltages are different and it will cause issues.
Desulfators are not necessary unless you leave your batteries discharged for extended periods of time.
If you go for a single high voltage charger, the elcons are the cheapest I've found that I'd actually want to put in a car. The schumacher chargers work decent, but are horribly inefficient in my experience. If I had your setup I'd check ebay for some cheap ~10A chargers made for lead acid batteries.
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