I'm in agreement with Evelyn...it depends on the neighborhood and the cost of repairs you have to put in the property. I try to start with comps and work backwards...how much will I need in repairs/holding time, etc., to get it where I want it while still preserving my profit ratio. This holds true for buy and holds as well and flips. Once you get an idea of what works well (tiled shower/bath stall, tiled kitchen floor, appliances) in the respective price range this will go pretty quick for you.
As an example, in my lower end properties many times I'll just paint, repair cracks in drywall, tile bath and kitchen, spruce up exterior and it's ready to go. As the ARV goes up I find the extent of repairs/improvements does too. The key for me is to have all this figured out before bidding on the property...then add some additional repair costs :)
I find it really helpful to talk with investor/rehab, realtor colleagues in your area to get a feel of what the ideal marketable property for your price range looks like.
Hope this helps. I am by far not an expert but have been doing this for about 7 years.