Also, have the realtor pull you contender properties now and the market rent they command. 

typically as others have suggested the 3s and 4s do better for investments, but the 2s tend to be in better locations and command much higher rents per floor, they also get you much better tenants as it is easier to divide up parking and yards etc by 2 then by 3 or 4, also repairs, especially electrical are easier on a 2 as you can get to everything from the attic or basement. 

Taking this approach seems like it will put me at a pretty serious disadvantage compared to other investors though - primarily from a volume perspective (i.e. investors closing 5, 10, or 15 deals a year would command more attention/preferential treatment than I would,  closing only 1 deal a year). 

I'd love to get a four plex but those command higher prices ~ upwards of 450k 

They command a higher price than the unfurnished competition.

I think it will take 5k per door to bring property from a C class to a B class and command a strong rent. 

Do some cosmetic upgrades (paint, countertops, cabinet hardware, appliances, flooring - if allowed - see governing documents, lighting, etc.) to attract quality tenants, command market or above market rents, gain appreciation; 5.

Am I incorrect to assume that turnkey companies have to buy a salveagable structure at $10k tops and have the rehab under $20k in order to sell as a fully renovated turnkey investment at $50k-ish that commands a $650-$750 per month rent?

There is a "download" command under the podcast box.  

In my opinion, you will be able to command a higher rent and that usually means better tenants.