I hate to make my first post to this list a classic rookie question,
but I really want to get working on my project over the Christmas
break.

I have eight banks of eight LEDs arranged in a common cathode array.
My original plan was to use a 74HC138 as a bank select, and wire PORTB
to the anodes through current-limiting resistors.

The 74HC138 can only sink ~25mA, so I was planning on presenting only
one bit at a time on PORTB.  I did some more calculations, and I find
that this approach will be too slow.

So, I want to be able to sink more current (20mA/LED * 8LED = 160mA).
This is where I start to get out of my depth.  I'm thinking eight PNP
transistors (2907?) with the bases attached to the 74HC138 outputs, the
emitters attached to the banks' cathodes, and the collectors grounded.
But I don't know if I need current limiters between the transistors and
the 138.  I don't know if I've chosen the right transistor for the
job.  I don't know if the information presented in, say, the Digi-Key
catalog is enough for me to pick the right transistor, or if I need a
data book.  I don't know which data book covers these parts.

I'm not describing my problem in order to have someone present me with
a solution, just to describe my level of expertise.  The sci.electronics
FAQ recommends _The Art Of Electronics_ (2nd ed), by Horowitz and
Hill.  Is this a good book for someone at my level?

Thanks,
Brian