The Energon Pub

Could someone tell me which Transformer comic series are being published right now with new issues?

I am still reading the Generation 1 US and UK comics, so I don't want anything that will spoil those stories. I'm also not interested in anything related to the live action movies. I just want something current that I can follow, while I catch up on all the older stuff.

IDW's Ongoing - if you can look away when there are writer changes, the series is a consistent story that started with Infiltration (back in 2005-2006...)

The original Marvel comics lasted until issue 80 before it was cancelled in 1991. IDW is going to continue that series next year starting with issue 81 with Simon Furman, so you probably might want to not get that until you get there.