What is the best (cheap, light, bagless, cordless) vacuum for hardwood floor?

I need a vacuum....please help me...

It should be cheap because I already have an expensive one which I think useless for me...

It should be light because my expensive vacumm is so big and heavy...it makes me afraid of cleaning...also, i have stairs (hardwood)..

It should be bagless and cordless because bags and cords are very annoying...I am simply lazy..i guess

I am looking for something under $50...I don't have carpets or rugs. Only hardwood floor. no pets. I will use it 10-20 min everyday for light cleaning...

any recommendations?

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