2009 Topps UFC autos have really dried up, and with boxes priced at $600+ they are only getting scarcer.
Round 2 and Main Event boxes are getting scarcer, so the autos should be a good bet.
2006 Allen & Ginter Randy Couture Auto is rarely listed any more, and I think has potential with a current price of around $150.
Any new #/25 Topps UFC are not difficult to find, and you run the risk of the fighter losing a fight.
"I hereby declare we have Spaghetti Tuesday every Wednesday, first thing we need to acquire is some spaghetti". - Hershel