Caden's Wrath is amazing. It has +22 damage. It has 7 enhancement slots.
But the best thing about it is that it has +24 technology as a stat modifier!
The level required to use it at max power is lv.28. To equip it you need at least; 37 strength and 31 dexterity. It is at 8000 credits and you can buy it from Caden in the mine tower. I recommend it to lv.28-30 tech mages.
Mjolnir only has +20 damage but it has 6 enhancement slots. Its stat modifiers are the things that make it good. It has +5 dexterity, +10 technology and +10 support. To use it max power you will need to be lv.23. The stats required are; 30 technology and 33 support. You can purchase it from Mirv (Barren's Outpost) at 2210 credits. I recommend it to lv.23-30 mercs.
Omega blades 2 has +22 damage and 6 enhancement slots. Like the other 2 weapons, it is on the list because of its stat modifiers. The stat modifiers are; +8 dexterity and +8 technology. You have to have; 28 strength and 34 technology. The level required for maximum power is lv.22. You can buy it from Thalia and from Mirv for 2300 credits. I recommend it for lv.22-28 bounty hunters, then getting something better after that.