Purchasing Condo

Hi All, I'm hoping to purchase my very own condo in NYC, so I thought I'd ask you guys for a bit of advice. My budget is $750-$850K, I'm looking to make an all cash purchase and not take out any loans. What is feasible for me? Am I able to find a nice building in Manhattan or should I venture out? What should I look for in potential buildings? I'd like to live in a place that's nice, with a virtual doorman or a real doorman, I'm not picky about that. Mainly I'd like maintenance to be low. Should I hire a broker? Ideally, I'd like to turn a very small profit 15-20 years from now, and basically not lose any of the value... Any advice and help would be greatly appreciated! Thanks!