Buying online and best options for downsizing from CRV?

Buying on-line requires the same careful consideration as buying from anywhere else. You certainly don't buy sight unseen; always see the car for yourself. Be wary if the seller suggests meeting in a public place, or at night, or somewhere that might make you suspicious. It's always worth having someone else with you at the time. If you want something a little more exciting you could look at various European brands, Like VW, Renault, Skoda, but in saying that I need to add that the Asian brands like Honda will generally be cheaper to run and maintain than the Europeans.