Hi Rick,
You sound as if you are either trying to save $150 or in a hurry to buy a keyboard.

Here is my opinion. No one has provided review to the YPG-625 yet. Few people on the Zone said they were impressed by the keyboard when they saw it at the winter NAMM. My main concern is how this keyboard sounds (I consider getting the 625 at some time, too). If the 625 sounds superior to the DGX-300/305 it will be better to wait till June . The specs say there are 4 more sweet! cool! and live! voices than the DGX-305. If this is the only difference in the sound department (all other voices are of the same quality as in the DGX-305) then it might not worth to wait till June. In that case, it will be up to you to decide if you want to carry around 2 keyboards weighting 50 lbs or one weighting about 30.

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Using the RS to control the 300, wouldn't you basically have one of the new $750 Yamaha YPG-625's coming out in June?
Definitely, no.

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Would the bottom seven notes work?
Yes

Personally, I own a DGX-305 and I am happy to a certain extent. I miss weighted keys for some of my compositions but I'll go for the YPG-625 only if it sounds superior to my present keyboard. I am looking forward to the first reviews of this keyboard (and especially yours if you decide to wait till June)

Best wishes
George