Booting from USB flash drive

Hi all
I have a laptop Dell vostro 1720.. I want to run a hackintosh (10.5) on a USB flash drive.. Any requirements or advices about what type of USB flash drive I should buy? I know hackintosh requires a minimum of 6 GB, so for minimal uses 16 GB will be sufficient, isn't it?

Thanks

Yes, 16GB is enough for basic usage. Many people who hackintoshed dell mini 9's only had 16GB SSD for storage.

I'm regretting not buying a MSI wind or Dell mini 9 back when I bought my netbook. I got the best one at the time back a few months ago, but it doesnt work with OSX very well, keyboard/touchpad messy and dont work 90% of the time, audio doesnt work, and wifi doesnt work.

Not worth selling my netbook to buy a lower model one now though. If I had mad money to spend I'd buy a Dell mini 9 right now from Dell right away.