Cisco CCNA - Help ?

I'm about to buy (2) 2501s and (2) 2950s...

1) Does it matter if the routers have full 16/16 memory? Will there be a noticeable performance difference? Or is 4, 8, etc fine?

2) Should I also get cross-over serial cables and/or AUI transceivers? What are the transceivers used for?

3) If the routers come w/ an older IOS, how easy would it be to install a newer IOS? Are these IOS's available for download somewhere?

Thanks!

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dragon
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