I have worked with all the tube scripts at one point or another with design or integration. IMO
www.mechbunny.com is the best. $1500.00 for the license and you can have 1 site or 100 sites. His script can handle the traffic and the script is easy to use. I use it on my sites and recommend it to anyone looking to really get into the tube game. Konrad is always around and works with all his clients to assure they have the support they need. MechBunny has it locked down!