I'd buy MORE bitcoin :-)
Yay you would be buying my bitcoin if there was no reason for the rise to 1000+ if there was a reason then i would most definitely hold but anything else it is time to unload my holdings until the next drop then i will be back with a bigger stack.
unlikely.
The first run to 1000 was fueled by capital flight from china, which was eventually neutered and what was likely an inside trading bot at mt gox.
a second run to 1000 from here would be straight fundamentals. a lot of money from gemini and coin, gbtc, dont really move around. There would be a legitimate floor for bitcoin barring some zero day attack.