decent, reliable merchant/gateway

Hi all

I'm putting together a retail internet site, and I'm looking for a
decent, reliable merchant/gateway solution, preferably one that can
integrate with html and/or c# (asp.net). The prices vary widely, but
that is a tertiary priority (primary is reliability, secondary is
features).

Has anyone used electronictransfer.com? That looks decent.

Thanks, all!

SG