I too am ready to paint outside my home, though I am only doing shutters and door. You have more to invest both with time and money so get the best. I am using Consumer Report to guide me in my purchase. Here are their top few. Keep in mind no other paint rated this high. If you are repainting every 4 years, as you will need to with other paints, why not get one of these with 9 year rating? Do the math, the others were 3-6 years, that makes the cost of one of these 3 a LOT cheaper in the long run:
Californian, Fresh Coat Velvet(flat)$28; Pratt and Lambert, Accolade Eggshell (flat)$35;Gliddon, Endurance(semigloss)$32. Go to their website to locate dealer. These three were rated the highest in up to 9 years of appearance still being good. All resisted dirt, color change and milldew. Good luck!
Ugh. I can't stand Accolade- I used it on one project last year. A large estate home here in the Bay area. Almost 55 gallons on the stucco. I did not like the way it grabbed (or lack there of) the substrate-had lots of problems. The trim was horrible- it kept running and sagging like an old oil paint, almost every window had to be touched up afterwards.
Accolade is a very good paint in terms of durability, especially the eggshell finish. It does have it's share of issues though. Anything past the lightest tint bases gets runny. It's very hard to work with. You have to learn a whole new style of painting to get good results out of it. I don't really care for the sheens it comes in either. Eggshell is more like Satin and SG is more like Gloss. That being said, I've got the white SG on my back door and it's tough as nails, but still too glossy for my taste. I had to shoot some Floetrol in it to get good results though. It tacked up way too fast. All in all, I'd just as soon use P&L Redseal which is a lot cheaper and gives very good results without all the application issues.