Budget Motorhome for OAP first time buyer

Hi, after years of dithering we have finally made up our minds to trade in our caravan for a secondhand motorhome. We were just about tempted today to purchase a 2010 Compass Avantgarde 120. The dealer suggested we wait to see a 2010 115 that he's got coming  in at the weekend. He says it's a better layout. 

We don't know much about motorhomes so would appreciate any suggestions on makes and models that could suit us. We only need a two berth and one about the same size as the avantgarde 115/120. We've been looking online since we came back from the dealer today and it's all very confusing without having the knowledge.

Thanks for any advice.