I agree with all of above. Do some research, narrow your choice down. Decide if you can accomodate a large tort, if you want to pay heating bills all winter etc & then when you have a few in mind ask specific questions about said tort. Owners will be more than happy to share their experiences with you. If you look in the med section (think its the top one as you look at the page!) there is someone doing just this & getting lots of replies, perhaps some of that info may help you?
Good luck & dont be afraid to ask questions, were all here to learn!
