My favorite tone of all the inceptions is the original 100w blue channel with a boost. It was my main amp from 2007 until about 2012. I had no issues with the amp except for a blown preamp tube. Most problems with the early amps were from a poorly made proprietary foot switch cable, which was never an issue for me since I always ran midi (using an RJM mini amp gizmo). Also, the first 1000 or so amps built used a mix of EHX and Sovtek preamp tubes with Sovtek power tubes that I think sound better than the later amps which come with all JJ's.
That being said, I wound up trading the 100w head, something that I never thought I would do, for an SLO (plus cash) The deal was great and I couldn't pass it up as the SLO has always been a bucket-list amp. I still have my 50w EVH which I really like, but my main gigging amp now is a Bogner Shiva 20th. I guess I was ultimately just looking for a change and was re inspired by the Bogner. Also, the 100w EVH is HUGE! I got tired of lugging it around.
Even though the 100w blue channel may give the best tone (boosted), I think the 50w may be the way to go as it sounds huge and loud with tons of gain. Very similar to the 100w with the added benefit of smaller size, resonance control, and on-board midi. I didn't mind the shared EQ of channels 1 and 2 of the 50w. This was an issue for many however.
EVH amps have to be one of the best deals going in the world of guitar. Especially in the used market.