Is there anything I should concern with a UV printer?
Speed, reliability, inkset, resolution, print quality and cost (short term and long term). As with almost everything higher initial costs lead to lower longterm operating costs. If you care about print quality 1000+dpi with an 7+ color inkset that includes at least one light black ink is worth going for.
I personally don't see or have experience with the OCE Arizona printers that you mention. Not sure why my clients don't have those.