Myself, I would pick Goku's Kamehameha, Instant Transmission, and Spirit Bomb attack, I guess.
I'd definitely want Krillin's Kienzan (Destructo Disk).
Gohan's Masenko is an excellent technique that I'd love as well.
The all time classic, Bukū-jutsu (Lighter than Air, the ability used to fly) is one that we should all have! Lol
Vegeta's Garlick Gun (Renamed Galick Gun for the English Dub), Final Flash and Big Bang Attack are some excellent techniques, must-have!
Tien's Taiyoken (Solar Flare) and Tri Beam are for the win!
Trunks' Burning Attack and Finish Buster are good too.
And for the count, I'd love to be a Saiyan XD Like Goku, not like Vegeta. I'd want to be good, not evil! (Well, Vegeta turns good... >.>)