I have a kinetic/energy blast defender... I have the following attacks from my secondary:
Power Bolt
Power Blast
Energy Torrent (took this at 49 to help with some kill badges)
Power Push
Nova
Then I also have
Air Superiority
and Thunder Strike (from the electric epic)
I tried out a fair few of the other energy powers on my way to 50 and to be honest I never really found them that useful and for the most part I use the energy attacks I do have to position mobs to better heal/give endurance to the team. Air Super and Thunder Strike are probably the two attacks I use most to defeat things as on my last respec I was aiming to have a semi-blapper build...
I suppose since you are in the thick of things a lot something like Power Burst might suit you (as it's a short range attack). Energy Torrent is probably useless-ish as of the knockback factor, and it scatters mobs a bit too much (and you may find explosive blast is similar)
Which epic do you have?
cheers for that, power burst was one of the powers i liked before i went for a full support role
i went for energy for my epic
ah so you are going for Total focus? That combined with power burst and maybe something like air super would give you a semi-decent attack chain for some close range damage 
yep. not really looked at air superiority, doesn't really fitr conceptually that Atom would actually go hand to hand
i'm considering respeccing my pure kinetic build (level 44) mildly to give me a more offensive build. currently i have only the initial attack and the nuke.
looking at power that i don't use i can free up two power slots.
my prefered play style is right in the thick of things, yes it means i die a lot but i like the seat of my pants approach.
so please, what additional attack powers would you suggest