So the ones that would rent for $1000~$1200 would probably be a house that goes over $100k in price easily (if it's a turnkey). Probably more in the range of $120k~$180k (not new constructions, new constructions would cost way more). They do rent well, the price to rent is slightly better in lower range housings (ones that goes for maybe $60~90k that rents for $700-900ish, but tenant quality won't be as good and you may experience more turnovers. There are several REALLY BAD PMs in the area that I would tell you to stay away, but AG Rental is one that I would recommend. However, if you are local and you are buying a turnkey, maybe you want to consider self managing.
In Terms of valuation, there may be a little more upward push, but i don't expect a whole lot more. The pricing has gone up SIGNIFICANTLY in past 2 years (or at least that's how long i've been investing for) and i cannot find the same deals I was finding 2 years ago anymore. To give you an idea, the first property i purchased 2 years ago was pretty much a turnkey, i purchased it for $78k. A year ago, that appraised for about $110k, it would appraise for higher now, probably closer to $130-140k would be my guess. Not sure if I should consider that lucky, or since it's very difficult to come across good deals nowadays not so lucky...