I take the idea is to outflow less cash than renting and not equity (not necessarily the same perspective).
If cashflow is only the important factor here, then the only question then should not be the price of the house but how much you would pay per month including what you would receive from a tenant.
A quick calculation for $600k at current fixed market rates, even with only 10% down, you would pay around $3,200/mo including everything, tax, insurance, PMI, etc. You have to account for some repairs and maintenance so let's say it'll all cost $3,500/mo.
A renter would probably pay $1500/mo as mentioned in the current market and there is probably lots of people looking for this price range.
However, as your cost will be fixed, the question becomes, could you still pay your mortgage if rent prices were to fall, say to $1000/mo? It would then cost you about $2,500/mo, still below what you pay now in rent. Could you still pay the full $3,500 if you were to not find a renter?
If the answer to these questions is yes, then there is no reason not to buy, as long as you have the down payment.
If you also look at opportunity cost of not investing the down payment and the appreciation (or depreciation) of the house, then you have more aspects to consider and buying low then potentially becomes a more important factor... but it can also keep you from doing anything...