well, you can guess why i chose to take a closer look at pfsense twice, but you'll only gonna need one!
I tried one of those "loadbalancing soho routers" from Allnet - not my best choice yet, not to say ugly things about it…..
Then I tried Netgear (about 250 US$), not cheap, but if it works well, why not - ok, not so well, in fact, massive probs with https-sessions broken (used both wan-ports for single onlinebanking session - not so good then...) and sometimes DNS-Querys just got lost, so no answer to browser, except "server not found".
My next choice would have been a small, tiny Cisco Loadbalancer, not exactly the price of a new car - even a japanese one (by the way, i own a Honda Civic! - so no hard feelings - ok?)- but a nice Homecinema Flatscreen TV would fit much better in the plans of the wife than this "little gray box".
So I have to investigate open source software if anything there could be my salvation. And now it looks like I've found, what I'm looking for (unlike Bono).
So I consider this "Bounty" thing for adjustable round robin Load Balancing. Perhaps, if there are some others, we could join for a bounty and make the developers or advanced users help us on this one? I don't know how much work it would be, but I would not wonder if it could be resolved quite fast (and cheap ;) )