Special Weapons: Definitely take a lot of these.
Heavy weapons: Ahhh, probably not.
Icons: Useful, definitely useful.
Meltabombs: 5 points a pop, so why not?
Combi-Weapons: Same price as Special weapons, and worse, so probably not.
Aspiring Champion: I don't think so. For 10 points, extra attack? No.
Special Close combat weapons: Probably not, if you want a good CC unit, look at Termies. Much better value.
So, several units that I think are takeable:
Chosen unit 1: 5 Chosen w/ Meltabombs, 3 meltaguns - 145 points
Cheap, and versatile. With a lot of melta weapons, this is going to give any tank a very bad day, from range and assault. Deployment for this: I would say no deployment, hold them in reserve, and then outflank with them. If you want to, you could also get them near to the enemy lines, maybe blow up a tank or two, and hopefully distract the enemy for a turn, while the rest of your force moves up.
Chosen unit 2: 5 Chosen w/ 5 flamers - 115 points
Super cheap, and incredible against light infantry, this is a good unit to take if you know you're going up against a lot of IG, nids or orks, and it can even put a dent in marines.