This whole "Nero got help from the Borg" bit sounds utterly silly to me. Nothing of the sort is suggested in the movie. No encounter with the Borg is mentioned, nor is there room for one in the timeline, or any sort of rationale for why Nero should emerge victorious and get a shipload of Borg loot. It would perfectly suffice that Nero gets his supervillain strength from three simple facts:
1) His ship comes from the 24th century.
2) His ship is massive and can thus take much more pounding than the Starfleet midgets, while also carrying a much bigger warload of weapons that need not individually be especially powerful.
3) His ship carries red matter.
The latter point is the only treknologically and dramatically interesting one here, really. Does he get all his red matter from Spock? If so, did he have red matter available when he destroyed those two score and seven Klingon ships? Or did he achieve that before capturing Spock, solely by the "natural" strength of his mining rig? From the scene where Nero extracts enough red matter from Spock's cache to destroy Vulcan, we learn that he would have had enough to destroy hundreds of planets and still plenty left over to destroy thousands of starfleets...
Timo Saloniemi
The Red Matter Nero obtains is actually from Spock's ship, aka The Jellyfish.
In the film, we see that it is extracted from that big red ball of it on Spock's ship, then sent down to Vulcan through the hole it drilled.