What's a good transistor to use to drive Common Cathode 7 segment displays?

TIA
Colin

>  I have a question regarding the driving of 4 7-seg displays. Originally,
>I did
>this the easy no-brainer way, which was basically use 2 whole ports
>connected
>to 4 7-seg decoders, and then to the displays... but this, obviously, takes
>a
>lot of IO pins. I then went on the piclist site to see if there's a better
>way,
>and came across this method:
>
>http://www.piclist.com/techref/io/led/8x7s8pin.htm
>
>It seems like a great idea (although harder to code), but first off, does
>this
>method have to be done with common anode (as is described), or can I
>basically
>reverse it to use a common cathode display? I don't see any problem with
>doing
>so, I just figured that I might be missing something though. Second, are
>there
>any better methods that are commonly used?
>
>Thank you all!!
>
>Jai
>
>
>
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