The only mods I want are police overhauls for some/all cars (Most likely by mods, which means it probably wouldn't be usable in MP, but oh well) and hydraulics (Lowrider meetings/competitions anyone?)
But as for GTA Online experiences recently, I managed to hold off 7 or 8 players trying to kill me for a $1000

bounty. Buzzards, Zentornos and Jets were all in the area. This was all on the roof of the LSIA.
The first person to try to kill me is a guy with a Buzzard. Flying around, but putting quite a bit of distance between me and him, making him slightly harder to get with a sniper. So as people are nearing, he suddenly rockets (

) towards me and manages to fire his missiles and machine gun. But with his bad aim, I manage to kill him with my Combat MG.
Another 2 guys arrive and manage to get up onto the roof of the LSIA as well. They did manage to shoot me, but I ''accidentally'' managed to fall off the roof and died, but I didn't lose my bounty. I went off the radar and got around and up to the door giving access to the roof. Just to make sure, I shot open the doors, but sure enough, they were standing there, both waiting for me with Assault Shotguns. Managed to kill both without losing half my health.
Of course, as more people arrive, hell starts to ensue as people go against each other just to be the one to get the bounty. Another Buzzard tries to kill me, but with the same fate as the first one. Titans are divebombing me. People gang up in helicopters to shoot me, but I shoot them down too.
Some guy does manage to get me, because I was distracted by someone trying to land on me, but overall, I felt pretty badass doing that whole thing.