Have you done an RYA Powerboat one or two course? If not have a think about it, as lots of questions like this are dealt with; plus lots of questions you may not know to ask.
Back to anchors, it is the chain that does the work so have as much as you can sensibly store. Danforth or Plough anchors are both very versatile, have a google for examples, something in the 2 or 3kg size should work great (so long as you have lots of chain).
Once you have worked out the best anchor to fit your stowage, and added as much chain as is sensible, then add as much rope as you can. There is a technique for looping the rope in on itself to make it shorter, so that for every day anchoring it is not in the way but if you ever need the full length you can unping it quickly.