what Watchguard subscription services do you recommend?

I'm new to UTMs.  A client has an XTM 25 for 6 users.  They recently got infected from cryptowall 3.0 with another consultant.  Now I have them (I guess they didn't like that the other consultant didn't protect them?).

They have a watchguard xtm 25 and no subscription services.  Some questions:

a) if nothing else, the subscriptions can't hurt adding another layer of protection and likely help
b) which would you recommend without too much (any?) degredation of performance?

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Standard support subscription is needed to patch Linux renamed into XTM/UTM
For the rest inquire sales, list here: http://www.watchguard.com/docs/datasheet/wg_subscriptions_ds.pdf
Web filter and antispam should have little impact, but both either very useless without heavyweight siblings.

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