Regardless of what you think of the store, the Aldi wetvac is very good and at £45 when I bought it two years ago has paid for itself many times. It has a stainless steel tank and can suck up better than Michael Gove does with Boris Johnson. Not had a single issue with it. Only downside is that it's only on sale when Aldi does their special buys.
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With any wet vac, you can fit a tank connector to its base and connect a drain hose to it. That way it will never fill up and switch itself off at its float switch. Saves having to constantly empty the damn thing on big jobs. Mind only do this if you have no intention of claiming any warranty.