looking to buy banner type ads(any suggestions for ad networks)

Looking for recommendations for ad networks

[rbacal]

I'm considering experimenting with some banner advertising (perhaps of various sizes), and I'm interested in a relatively small initial buy. Any advertisers out there who have suggestions about companies they have worked with e.g. Burst, Fastclick , rightmedia, etc who have recommendations.

Rightmedia looks interesting as a model, but I couldn't find details or method to sign up as an advertiser (I hate that).

PS. If you are associated with an ad network and want to contact me with a pitch, I don't mind, but obviously, do it privately since it's probably not appropriate to do it in public.

[limitup]

Most networks have a minimum buy of at least a few grand, all the way up to $5k or 10k. If you just want to do a small test your best bet is to find an individual site you want to advertise on and work out a deal with them.