Daniel,
I think you need to get with a qualified realtor, and by qualified I mean knows your market well and has proven their skill, to have them tell you what the after repair value is going to be. If you show them the property and tell them what you plan to do with it they should be able to advise you on what they think it will sell for and how long it will sit on the market. You can also pick their brain on what repairs should be done and what features need to be added to up the value.
The two comps you list are those the prices they sold for or the price they started at? With a 50,000 difference your property may be a deal worth doing, but you need to know the numbers. I love to invest in small rural markets. It is easy to get to know the market and easier to get the word out that you buy houses. Plus when you do good work word will spread quickly.
Once you know the likely realistic price you will be able to sell it for then you just need to run the numbers to see if the profit potential is worth it to you. To increase the profit margin you may also want to consider hiring out some of the work to speed up the time it takes you to complete the project. I can do most of the work myself as well, but I find I make more money in the long run if I focus on finding and negotiating the deals not doing the labor that I can hire out.
I always try to have at least two outs for the properties I buy. In your case once you rehab this potential property what would it rent for? Would it be enough to cover your holding cost and provide a monthly cash flow? If so that reduces the risk as well. If for whatever reason you cannot sell you could rent for a time.
I flipped a house last year in a small town that I purchased for 55,000 that I put about 42,000 into in rehab. It took me about 6 weeks to complete the rehab and get it under contract. I cleared about 58,000 on that property. I would have did the same deal if I was only going to clear 40,000. It all depends on what you're comfortable with. I have another property on the market now that I bought for 65,000 in a rural area that I put 42,000 and some change into the rehab. It's listed for more than 200 right now so will see how that one turns out.