1. make sure you get the P4 2.0A not the 2.0
2. if you can afford it, get PC2700 ram. it will give you better performance. 512mb sambsung PC2700 is a pretty decent price.
3. As you getting the S533 with the 133 system bus speed it may be better getting a P4 'B'
<font color=blue>Pants Down! Turn Around! Bend Over! You're about to Experience Telstra broadband!
Rambus is actually better IMO (now that we have 133 x 4, rather than 100MHz, quad pumped rather than double data rate, serial instead of parallel, RDRAM is faster, but slower latency times, meaning it will take longer to find the data you need, but once the flow starts it will be faster), but more expensive . However the latency issue really isn't very noticeable since RAM is so fast and runs on a direct bus anyway (as opposed to something like a harddrive).
For RDRAM, you'll need a motherboard that supports RIMM instead of DIMM.
I don't know about integrated NIC/ethernet, but you can find a NIC for pretty cheap (less than $50).
By the gods, may I please recommend a high quality NIC? Like 3Com or Linksys? d-link sucks arse!