Sorry for lack of reply. Havn't been online. ^^;

I dont think there is a size between the two but the big one, while huge, would give Ollie the most bang for your buck. Petsmart has it on petperks pretty often and you can also try Amazon and craigslist for a cheeper price. Azy has a tendency to bang into the sides of the tank at night when she goes for a cricket or just hops around. Really there is only room in it for her hiddy hole (she prefers to sleep on the floor of the tank rather then up top during the day. dont think its normal but shes happy so eh), her water dish, and the plant (which in reply to an earlier question: DO NOT USE FERTILIZER. its harmful to your frog. If you get a plant from a normal retailer, like walmart or such, then take the plant out of the pot it came in, rinse out the roots carefully but as best as you can making sure that all the white balls of fertilizer and styrofoam are gone. then rinse the pot and the leaves of the plant gently and replant in whats called "eco earth" available threw most pet places, for sure at petsmart. Eco earth is basically coconut compost so the plants will thrive better then if they were in the fertalizer). My plant is currently in its original pot but I think it might be root bound and needs a bigger pot which probably wont fit in the current tank she has.

I think 65 is pushing it. You would be best getting an under tank heater to make sure the temps dont get too low at night. There fairly cheep.

Oh. And wood! Petsmart sells driftwood that has been treated. Fish tank wood and other ornaments are also good (percy, my green, loves this little stone pegoda from the fish isle. if there was one big enough for Azy to get in and out of I'd get one for her too XD). You can also take wild cut limbs, soak them in HOT water for at least an hour then microwave them for about 30 seconds or so (keep an eye on it. when it starts to steam take it out).