If you play the Distant Stars mod then the pirates have that combo, plus a Marza and Kol and a dozen other frigs just to keep your starbase busy.

the 2/3 dunov is handy but falls prey to ships that have remove antimatter abilities,

I personally like the Kol/Dunvo combo, with the survivability of the Kol by way of its adaptive forcefield mixed with Dunvos Shield Restore improves, both have anti-SC capabilities (Kol's flak burst and Dunvo's Magnetize) and then at lvl 6 you get Flux Field/Finest Hour which turns the Kol into a Gauss Gun Firing Machine. Also the Dunvo's EMP Blast can neutralize others ships abilities and remove anti-matter. Perfect for those annoying Dunvos on the other side of the attack force.

I'm not too good at SOSE, so I may be making a major mistake about how tactically solid this combo is, but my favorite combination is the Kortul Devastator and the Jarrasul Evacuator. The Kortul acts as a large sledgehammer, battering through the enemy fleet. The Jarrasul uses it's Gravity Bomb to keep major parts of the enemy fleet from retreating, thereby ensuring that my enemy leaves the engagement hurting, hopefully quite badly. While he's trying to rebuild his fleet, I can advance, using the Drain Planet and Colonize abilities of the Jarrasul to capture his planets.

Dunov shield restore is great, but if you run into a Radiance, Revelation, Jerrasul, Antorak, or the new and improved Kortul you could find one of the two disrupted while the other is focus fired. 

One of my favourite comboes is Jerrasul, Skirantra, and Vulkoras.  People vastly underestimate the power of repair cloud, while nanos can rip apart enemy capital ships, and as the battle drags on the Vulkoras bombards the enemy world.  Plus, unlike the standard Advent trinity, these guys work very well as individuals and you can split them up to your heart's content (VERY nice to see an enemy panic when they realize the Vulkoras isn't with your army, but instead is bombarding a different (and mostly defenseless) planet.

Replicate forces also works on Siege Platforms, which is bad news for the victim world.

The KolxDunov is definately a favorite of mine as well, and the next patch will make this considerably better. Especially when there's multiple Kols firing off GRG. I mean, Flux Field makes GRG cost about 15 Antimatter, so it turns the ability into a 'Gauss Machine Gun'.

Also, DunovxMarza is extremely deadly, and a bit easier to pull off. Using EMP Charge first, followed by a Missile Barrage will even cripple Heavy Cruisers!

DunovxAdvent, if done well, is absolutely devastating. It requires Flux Field, but it's dang incredible. Also, MarzaxRadiancexProgen can work pretty good, as Missile Barrage will clear out the weaker enemies while Cleansing Brilliance will then kill off the enemy's capital ships and HCs.

Another very fun allied combo would be ProgenxSkirantra. Especially when there's multiples of both. Whatever pierces their shields will quickly be recovered by Repair Cloud.

Heck, just about anything does better with a Dunov. It's like, the perfect support ship.

I think a level 6 Marza, and a level 6 Kortul Devastator would be absolutely devastating, but I've never seen the combo.

Fire the Kortul's Volatile Nanites before Missile Barrage.  It increases damage by 30%, and as each ship dies, spreads additional damage (150 to everything within 1000 range) thoroughout the duration!

Nice tip ! Thanks Warlord Mike !

Malice and any area of effect damage ability is pretty wicked.

'Twern't nothin', sir!

Hmm...here's an odd one:

RevelationXDunov Combo.  Guidance reduces the cooldown (or maybe I'm thinking of another ability), while Flux Field keeps the antimatter usage at miniscule levels.  Throw in a Kol for Finest Hour, and you've got a Gauss Machine Gun of doom on hand.

I like using a Kortul x Vulkoras. If the Kortul is at level 6, just use volatile nanites at a mob of frigates, move the Vulkoras in close and drop a Phase Missle Swarm. If timed right, you can clean out quite a bit (especially if the frigates are all bunched together).