Price is one component of the overall picture. 

Contract is probably cleaner as you could more clearly define defaults and remedies in the agreement that would allow for a breakup.

What defines a deal as a good deal?

I can guide to a platform where you can define your own region, feel free to PM me.

You should properly define "net profit" to get all expenses of "buying", "holding", and "selling" deducted from the contract price.The real danger is papering the agreement between the LLC and the GC. 

The duplex will have a party wall in the middle and main entrances facing north and south, respectively, opening to the two roughly parallel roads that define said block. 

(Education on the house is not a secondary component, several guys will just send their contractors out and assess the bids only, thats a move that only works for experienced investors) Good Luck! 

What would you say are your top 5 components of your business that have made you successful?

You need to clearly define what you are looking for and go for it.Also, you need to be ready to move fast as the market is competitive and this will not slow down anytime soon.I'm happy to help if you have any specific questions.Goodluck

You need to know the life of the major components and their condition:Foundation - any repair needed will be a costly one.Plumbing - if cast iron, it rusts from the inside out so you never know when it's going.