Raritan PHII
When cruising on a friend's Little Harbor 44 (some things were literally gold-plated), I noticed that it had Raritan PHII heads installed. They come in both electric and manual configurations. I figured if it was good enought for Little Harbor, it was good enough for me. The next year I replaced the old OEM model with a new one, and have been very happy with it for the past 6 years. I was really pleased to see that Practical Sailor recently rated it as a best buy. Once every 4 or 5 years it needs a simple rebuild for the gaskets and valves. One of the best prices I've seen for this model is Defender. Good Luck!