I guess my question would be... What do you need that v5 has but v4 does not? A P200 would be fine for packet filtering, SMTP proxy, DHCP, and DNS which work fine in v4. The really big benefits for going to v5 (snort, SMTP/POP3 anti-virus, spamassassin, extended logging) all require more processor to run. I guess you have to ask yourself... Am I upgrading because I want something new or because I need the additional new features of v5. You might have to just bite the bullet, and get a used PII or low PIII. They're not all that expensive ~$120 - $180 USD. Both seem to work well on my low traffic home network.
I allready got a Via C3 1000 that does in fact nothing at the moment. AntiSpam, Snort, etc would be nice, but I what I really need is a good reliable traffic accounting system, which does not work properly in V4.
IIRC, someone said during the betas that 5.x would keep working on P5.
I know there's a problem with the VIA's, from the error message ISTM that some P5 code doesn't work on them. I'm guessing Astaro will fix this, but it seems they haven't said anything yet.
