Replying to OFF CAMERA FLASH HELP

aight so yo, im thinking about getting some equipment to step up my photo game. haa.

using a 450D right meow.

ive looked at...

Vivitar 285Hv and a wein combination slave and foot for wireless triggering. costs about $140

Sunpacks or whatever not much research there... seem to be a good option.

Canon 430exII mad expensive but has built in slave?

SO basically i want to trigger 1-2 flashes from about 100ft away. i shoot in daylight and at night.

what are the advantages of the more expensive flashes.

help a NSer out get some +++++K. plz

IM A NOOB