You haven't given any details about where you are located, what class you are flying in, what you plan on using the miles for etc etc so a little hard to help. You may want to have a look at:

http://www.flyertalk.com/forum/skyte...-i-choose.html

http://www.flyertalk.com/forum/skyte...-i-choose.html

http://www.flyertalk.com/forum/skyte...eam-elite.html

All found in http://www.flyertalk.com/forum/skyte...ful-links.html