Hoilday Inn Family Suites I think you have made a great decision Sweetipie.
The reviews about their suites along with the amenities such as microwave, fridge, nintendo, vcr, (along with other miscellaneous) and not to mention the separate sleeping quarters will be nice for your family in having room to really spread out.
Also, I read things about family entertainment that the hotel hosts like karaoke and other activities that everyone has enjoyed.
I think your stay here will be definitely fun and memorable for your girls if you're leaning towards here like you stated. Also I recall many reports from people saying that their kids had a better time at HIFS than at Disney onsite (who would have known) and they were begging to return back there on next vacation.
I can't help you as far as suggesting which building to request that is closest to the lobby but I am probably sure if you put that in as a part of your reservation request they will do their best to honor it (also hopefully someone reading this can post about a building closest to the lobby). I read that the Disney theme you were thinking about asking for was really neat also.
But, I just wanted to give you all the positive heads up about this great hotel in case you had missed all the fantastic reviews and trip reports regarding this place.
Also, thought I would relate positive feedback about the hotel that you are considering at this time for your particular family and give some support in your own personal decision if wanting to stay here instead of trying to convince or dissuade you otherwise.
I know you must be looking forward to visiting Disney
and hope that your vacation will be spectacular!