Big Integra fan here as I still have 2 pre-hdmi receivers and amps running strong. I too have been looking at the drx-3.2 refurb from AC4L and was about to pull the trigger, but found out that the rz630 and vsx-lx303 are basically the same receiver with a few different features. However, they are both on sale new for the same price as the refurbished Integra. Also, you just missed the Frys sale, but if you can wait, the big brother (11 channel) Elite vsx-lx503 was on sale for the same price too.
To answer your question, there are not a lot of threads dedicated to these Integra receivers so there are no real reviews about issues and reliability. Since they are basically identical to the lx303 and rz630, you will have to use their dedicated threads and the Amazon reviews to make your decision.
The marantz 5012/5013 are good units, but for the same price step up to bigger, better cousin (Denon x3400/x3500) and get the best room correction software they have, xt32 with subeqht. The x3400/x3500 don't have 7.1 pre-ins for sacd playback and you have the step up to the x3500 to get a phono input. But these have a large dedicated thread and a lot of happy owners.
keep us posted!