Taxis are good for a party of your size. They run ~$45 each way plus tip. There are lots of vans available so carrying 6 is not a problem. I usually use SuperShuttle as our party is generally smaller, but with SuperShuttle you'll pay $8-10 per person each way plus tip so the taxi is better. You won't have to wait and you're guaranteed to have the van to yourselves! Ask for a flat rate, which you should be able to get from the airport to the hotel. You will likely have a metered rate coming back but I'd ask. Our metered rate was about $48 coming back so it wasn't much different from the flat fare.