Hi Leo!
Nod32 the best choice, i think..

Never seen prob with that..
Eset security: one pack with nod32+ firewall+ spamfilter.
On my xp: use kerio personal firewall+ nod32.
On my vista: just use nod, there not need firewall..
(im browsing behind the router, built-in firewall)
Im use nod four years, never was viri on my hdd.
Use more, gmail spamfilter on web, that work for me..
(gmail use own built-in virusdetector indeed)
Nod run very small memory, faster than others.
On my workstation pc was norton too, but once i say my own, trying nod there too.
Result: was 6 activ viri..
hehe (that pc was very slow, don't know why

)
Maybe others tell u another..thats the truth.
So, if u want new security suite, my vote Eset.