I've lived in the area since 2002, and the area east of Ban Phe, including Laem Mae Phim is one of my favorites.
There's always been a good range of accomodation here, from the usual Thai joints, small boutique hotels, and even a Novotel. Now there's quite a bit of development going on, including a massive Marriot complex set to open next year, I believe.
However, it's still a pretty large area (Ban Phe to Lae Mae Phim), with a lot to offer. Nice range of beaches, from small little coves to long wide sandies. Certainly better than anything you'll find in Ban Chang or Sattahip IMO.
I agree that renting a car is a good idea, or rent a motorbike for a cheaper (and more fun) option. Should be easy to find both in Ban Phe.
Like I said, don't just limit yourself to Laem Mae Phim, the area has a lot to offer, from racuous Thai beaches to quiet (sometimes unbelievably so) little getaways.