For VCA you can't go wrong with the Intellijel Quad VCA. 4 VCAs in a single module that can double as a mixer. Very useful both now and down the road when you have more modules.

The sky's the limit when it comes to what filter to use. The most popular "basic" filter is the Doepfer A-124 Wasp filter, which is a 12db basic multi-mode filter, but really any filter you feel like would work for you could be used.