The link below will take you to the MTU page which gives the requirements to run Microstudio. I don't think any of the brands you mentioned
would present any particular problem.
If you're just looking for portability, fine, but if you're thinking of running a show, then do yourself a favor and get Hoster.
You can check out the computer requirements for Hoster at the Karaoke products info page. Buy your laptop accordingly.
http://new.mtu.com/basics/karaoke.htm
Hope this helps,
George