Lets see, as an Ork player, I'm afraid of...

-Template and Ordinance weapons (Pie plates and flamer templates ruin my Orks' fun...)
-Autocannons (Lots of attacks means lots of dead Orkies... And Rending gives it a chance to punch through Hard Boys.)
-Heavy Bolters (Shots that tear through Orks, with or without Heavy Armor...)
-Power Swords (They drop Orks dead and have a high initiative, while a Power Fist goes last, which gives me a chance to kill them first!)

Ummm... Nothing else springs to mind off the top of my head.

So, I'd suggest taking Power Fists instead of Power Swords, since while they do deliver pretty crushing hits and instant kills, they go last in initiative order, giving the Orks a fighting chance. Also, tone down the Template weapons. Take a flamethrower and rocket launcher or two, but don't load down on them. Same with the autocannons and heavy bolters. Maybe switch them out with some plasmaguns - they're still pretty effective, but have a shorter range and less attacks.

Oh, and buy random wargear to waste points.