any recommendations on a reliable paint sprayer to spay exterior latex paint on the house?

If you've never sprayed a house before don't do it. It's looks simple when you watch those home improvement shows but there is much involved in it. Being a painting contractor I know what I am talking about. BUT if you are feeling adventurous... The warehouse hardware stores sell a home owner brand airless that if you use it a couple times a year it'll work for you. Home Depot sells a Graco, the only pump I will ever buy, trying other brands and not being satisfied. Be sure to clean the pump with 10 - 15 gallons of water when you are finished, strain your paint and make sure your masking on the house is TIGHT!! With 2300 psi coming out of the home owner brand airless it will blow off your masking if your not careful. My suggestion, if your looking to save money do the prep work yourself and hire a licensed contractor to spray your place out, then paint the trim yourself. Last summer I had that exact job, it cost the home owner $400 for me to mask it and spray it, they bought the paint. Good luck.

If this is a one time deal just rent from a professional paint store. If you own a painting business I only buy Spray Tec equipment. If you are looking for something inexpensive ask about the rentals from the paint store. They rent for so may hours then will sell that machine after they do a complete service on that sprayer and offer a warranty