Hi,
Any video card would be good to work around the ECS chipset's restrictions...
As for Ethernet... it's of some use, but given the state of Amiga web browsers, you won't really want to be doing much Internet browsing on it.
Still, Ethernet's useful for file transfers, as is a USB interface. Or perhaps do both with an X-Surf card plus Subway USB...
And the stock '030 CPU is OK but an '060 is much nicer! As above, it depends on what you want to do with it. It's unfortunately too easy to spend waaaay too many $$$$s or ££££s on old slow Amiga hardware!
- Ali