There can be a big difference between memory modules. I always buy branded, but many others use generic. If you're planning on overclocking at all, I'd definately go with branded PC133 rated at CAS2. I earlier posted some sites that review memory <A HREF="http://forumz.tomshardware.com/hardware/modules.php?name=Forums&file=viewtopic&p=842#842" target="_new">here.</A>
If you really want the best DIMM around, buy Muskin PC133 Rev. 2. I have had this ram to 150 at CAS 2. I am sure it can be clocked higher, but my system bus can't be raised above 150 MHz.
<A HREF="http://www.mushkin.com/cgi-bin/Mushkin.filereader?3a1b00ef036091a4273f0a0001020544+EN/catalogs/4728" target="_new"> Mushkins Website</A>