your timing for buying one brand new is very good because most places have really good sales on last years models.
We bought an '07 Fleetwood Yuma - sleeps 4 comfortably or 2 adults 4 kids.
Came with propane powered fridge, stove and furnace so no need for hydro unless you want other luxuries.
For $7200+tx, it included the installation of a trailer brake for the car and insurance too. We financed it and they give decent rates. It was an'07 purchased in April '08.
I hauled it with a Mazda CX-7 for the first two years with no issues at all.
I'd say go new if you can.