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If you buy filters, Allan, and saving $s is not a major concern, yes, buy 2" filters which gives you maximum use.
Now, do you need filters? No, not really. But if you have then, it's always worth a try on different objects. All filters make things generally "darker", but that can be selective, so the contrast between things in the view can change. There are two I have and use the most - the DGM NPB filter which gives a stunning view on some objects - it is magic on the Carina nebula. The other is an OIII filter for when you are searching out planetary nebulae.
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