Yeah I have decided to spend the extra bucks to get a good one, after doing some reading in past threads and also based on your responses.
From reading the manuals online, it seems like the simplicity of the Lavac is hard to beat. The other seems less simple, but then again some manuals make things sound more complicated then they are. The side mounted pump of the other is very appealing, but the simplicity fo the Lavac trumps it. If I can find a good place to mount the pump for the Lavac I'll go that route.
Must it be mounted above the toilet? I'll have a very simple plumbing job. Water comes in, water goes to the tank. In RI we have to get an inspection that proves its impossible to discharge over the side (and they make us display a sticker) and I am not planning long trips anyhow. So Ill probably remove the through hull for discharge and glass it up. Some day. But for now, two hoses should do it...