MP4 video editor recommendations ?

so i just tried converting almost 5min (212MB, 360P) of video into "youtube" format. never done that before, i don't have a youtube account. that automatically makes the output 720P, so it tried to upscale it, great.
if i select 720P as an output, leave it at MPG4, and it still estimates the file at 155MB. still sucks. if i drop it to "widescreen TV" it estimated 99MB, ended up at 77+ MB. didn't notice any loss ion quality. it didn't get jaggy or anything. i'll try something highdef next.

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