I choose Iron Fist, Batman and Elektra.
Between the three, they have more than enough information on the team coming after me.
Taskmaster would be largely negated by IF and Elektra's esoteric powers - he's not replicating the IF, for example.
That leaves me with nearly 9 hours prep, which I think is enough for Bats to do his job, aided by the info from the Marvel side.
Batman is a must here especially for $300 and with prep. He already has plenty of experience against half of the hit squad, and has vast resources with things like anti-venom at the ready. Daredevil is essential too as he has plenty of experience against the other half of the hit squad and knows their tactics. Plus his 360 degrees radar sense will come in mighty handedly against elite snipers. Iron Fist is a bargain at only $300 and has enjoyed a considerable upgrade since this thread was started in 2007. Plus he can heal me from potentially significant injuries caused by the hit squad. And still almost 9 hours of prep for my body guards.