Hi Tim, a lot depends on what you want to use it for. First off, have you thought about an iPad. It's great for email, browsing etc and makes for a more enjoyable experience as you can sit outside having a cocktail while using it! Plus there are countless apps you can download that are ideal for RV'ers (see my article on Top 10 Apps for RV'ers). Otherwise, I would recommend a Mac. I know they are more money, but they last longer (this one I'm using now is more than 5 years old), are easier to use and maintain, great for managing photos and are just worth the extra money.
If you need Windows apps such as MSFT Word, Excel, or are just a glutton for punishment, then a notebook PC such as the Acer are small, compact and ideal for RV'ers, but they have a small screen which can be annoying and don't have a CD drive built-in.
For a traditional laptop, I'd stay away from DELL and probably go with either an HP or a Sony. Both are very well made and have good support.