You should decide if you want above ground or in-ground. If you decide to go with in-ground, you should do some research on vinyl liner compared with concrete. :-) Good Luck!
We have written on good bit on this subject: Please take a look at these blogs we wrote!
http://blog.akatlanta.com/2010/11/10-mistakes-not-to-make-when-heating.html
http://blog.akatlanta.com/2010/11/7 ... read more