my concern is the rehab budget, if you think it will cost $22k to rehab, be prepared to spend $27, and thats if everything goes well,,,there are always things that come up during the rehab, and a rehab budget that large (to the value of the house) is extensive enough you need a really good cushion
have you taken a contractor over to look at it? Have you checked on the actual cost of furnace/ac,,make sure your numbers are accurate and figure 15-20% for unexpected cost