On the market for $99,000 in a neighborhood where this style sells for $190-200K.

The issue is having the cash to take advantage of those, so you may want to build your network to include some hard money lenders that could work with you if that fits your investment model/goals.

Model homes, a pick-your-finish scenario, etc.

These are two very different business models. 

I love the townhome style condos that were built so that each unit had its own character...one brick, next stucco with window shutters, next different brick with larger window, etc.

Whatever style and bed bath count is the most popular in your area, within commute distance of central area, having a good grocery store nearby helps your value.

Sears scratch and dent seem to be the most competitive, and to your points will not carry much weight in terms of warranty / service given the struggling brick and mortar model. 

They all capture your contact information and sell it at exorbitant prices to several agents simultaneously, which is why you're getting so many calls.This is the business model of the 2000s. 

You'll need a good financial model in which to input the T-12 and rent roll data.

This model is well suited to singular and static investments such as crowdfunds and other private placements.IRA & 401(k) facilitators create plans that put you more directly in control of the funds and transactions.