Haven't played the Yamaha, but the Washburn is a great guitar for $150. For comfort, maybe check out a mini jumbo shape, the narrower waist makes it sit better in your lap:
http://www.worldmusicsupply.com/Wash...ic-Guitar.html
http://www.worldmusicsupply.com/Wash...-Acoustic.html
I prefer the solid wood Washburns but seems like new ones go for $500 or more. You can probably get a used one around $250-300.