🚀 go-pugleaf

I am looking for a chip which satisfies the following:

-There are two inputs (composite video signals, actually).
-There is one output (one of the above).
-There is a TTL control line which selects one of the two inputs.

In other words it's just a multiplexer.  However, I've only used a 4066, and
that thing doesn't work at high frequencies.  Any suggestions?

Oh, and in case you're wondering why I need this, it's for my home computer.
I got this external graphics box for $20 that generates sharp text, but slowly,
while my regular graphics output is fast (but has lower resolution).  What
I want to do is switch between the two video outputs under program control so
that I can switch between quickly-drawn menus and slow-but-clear text.

Oh, and thanks in advance to those who will post a suggestion.

                                             Jean Goulet
                                             Electrical Engineering
                                             Class of '89
                                             Concordia University
                                             Montreal, Canada