Like Bill said Mid's is the standard tool for working out a build. It'll give you all the numbers behind your powers and the total numbers for your build as a whole.
Outside of that there's lots of ways to go with a /regen scrapper; one of the more effective ones is to build for S/L defense and recharge. Get Mid's, also get Titan Sentinel (it will allow you to export your character's current live build into Mid's) and work out a build. After you've done that I'd suggest asking in the Scrapper forum for suggestions on improvements.
COH has just been murdered by NCSoft. http://www.change.org/petitions/ncso...city-of-heroes
I've tinkered with mids when it first came out but was already 50 and not a fan of respecs. I created Bill on day 1 after reading that "in beta, DM/regen has proven to be pretty much unkillable." I've been ecstatic and am very happy with him. However, running the incarnate stuff is bringing challenges I never planned for. Aside from the 'here's my build, what can I change' post, what's the best tool currently out there for planning a build? I've fully purpled one attack and have 3 more slotted in the other 2 powers that will use them. At this point I'm just looking for a nudge in the right direction on moving slots around and stuff.
I've never been a number cruncher but I defer to those who do, so once I get a build plan I'll toss it up here for evaluation.