Hi Dean - welcome!
About anchors:
The new breed of anchors (typified by the Rocna and Mantis lines) seem to have the best overall performance credentials in head-to-head comparisons. But before lashing out on a new anchor, I suggest that (i) you read the vendors' spec guides for the size of anchor you need for your boat, how heavily it's loaded and your typical anchoring conditions (high wind or current?) and then buy the next size up, and (ii) you download scale diagrams of the anchors you're considering (I know these exist for all Rocna anchors - I imagine you can get them for Mantis too), print out a full-size version, stick it to stiff cardboard and make a 2-D anchor cutout, and then see how the dummy behaves on your roller - the question is whether or not it's tip will gouge your bow/stem when it's pulled up onto the roller and if the shank is not so long that it interferes with key on-anchoring hardware on your foredeck (e.g., the position of the hawsepipe). If they are too long, look at the corresponding anchor weight in the Vulcan range from Rocna (I had to do this on my E32).
About windlasses:
For your boat, you might want to start with a fully manual windlass. From personal experience, I can assure you it's expensive and an LOT of work to install an electric windlass. If after a season with a manual one, and especially if you have to anchor with a lot of chain (and perhaps you have a bad back or sail solo all the time), then you might decide to switch to an electric one.
Good luck!