After a decisive victory Saturday, Hilo's BJ Penn now has a decision to make.

Lightweight or welterweight?

Penn said on his Web site yesterday that he is not sure what his next move in the sport of mixed martial arts will be after his resounding victory over Jens Pulver in Las Vegas.

In a video message posted this morning on bjpenn.com, Penn said: "I don't know what I'm going to do yet. I still have a lot of things to think about — sit down with my family and friends and kind of talk about what I should do next in my career.

"I don't know what I'm going to do yet, if I'm going to go back to 170 (pounds) or stay at 155."

Penn also thanked many of his friends and family members, and his fans in Hawai'i during the message.

Penn defeated Pulver by rear-naked choke submission in the second round of their lightweight (155 pounds) bout. It was the main event of The Ultimate Fighter 5 Finale mixed martial arts card.

The victory avenged a loss to Pulver in 2002.

Penn's professional record is 11-4-1, and his most recent losses came in the welterweight division (170 pounds) against Matt Hughes and Georges St. Pierre. Moving up to welterweight would give Penn a shot at avenging either — or both.

Staying at lightweight might give Penn a title bout against Sean Sherk, who is the Ultimate Fighting Championship's current 155-pound champion.

Saturday's bout was televised nationally on Spike TV.

In a live interview in the octagon shortly after his victory, Penn's only comment was: "If you want to know what BJ Penn feels like, check out bjpenn.com."

The response from fans was so overwhelming it apparently caused the site to crash.

Penn has been promoting his Web site for several months, and it now includes video of training techniques and bouts from his gym in Hilo. Penn said he wants the Web site to be "an internet dictionary-type thing for martial arts."