For neighborhoods, it depends on what your price point to purchase is. Also my advice, since you're not from the area, best thing to do is drive around the area and see what appeals to you. The first thing anyone buys is the neighborhood. So once you've identified the neighborhood you want to purchase a new home in, finding a home to buy becomes a lot easier.
$400,000-$500,000 - Village, Central Dublin and Echo Park (Mostly single family homes built in the 60s). Great area for beginning young families, most schools are within walking distance, and shopping is close by. Access to Public Transportation and Freeway access is close by for commuters.
$500,000+ - Silvergate, Dublin Hills, Dublin Ranch, West Dublin (Homes built between 80s-2000s)
$550,000 - Central San Ramon (Homes built in the 60s-80s)
$650,000+ - Twin Creeks, Gale Ranch, Windemere, Inverness Park (Homes built in the 70s-2000s)
$550,000-$600,000 - Valley Trails, Val Vista, Fairlands (homes built in the 60s-80s)
$600,000+ - Mohr Park, Ponderosa Village, Country Faire, Vintage Hills, Highland Oaks, Forest Hill Estates (Homes built in the 70s-90s)
I grew up in the area, so feel free to ask me anything you'd like to know about Dublin, San Ramon, or Pleasanton.
Better Homes and Gardens Tri-Valley Realty