My choice would be the Raritan Elegance
Raritan Elegance toilet which Practical Sailor rated "best in show" in their comparison of every major macerating electric toilet. I strongly recommend adding the optional "Smart Flush" panel...whether to also add the "Sea Fresh" option that allows you to switch between onboard pressurized flush water and sea water at will depends on whether you need to conserve your fresh water.
Coincidentally, someone who installed one a year ago just posted his "review" of it... read his comments--and I'm sure he'd be glad to answer questions too--in this thread:
http://forums.hunter.sailboatowners.com/showthread.php?t=134564
And you and I prob'ly should discuss the rest of the system...let's get it ALL right the first time! So send me an email if you'd like to talk.