I was just checking out lots of light bars on this website. Many of them are under 100.00.

https://www.houzz.com/products/bathroom-vanity-lights-prbr0-br~t_602

I just am curious what I'm dealing wut behind the light bar for install and if there are opinions on way looks better

You'll probably have a regular junction box behind the light bar. A new fixture would install using the same one, although you'll probably have to repair some of the drywall where the two fixtures don't match, or at least touch up the paint. No way to know how much until you take it down -- could be as little through the wall as a pair of wires in the middle.

Yes I'm painting as we speak. The whole bathroom was beige blah!

check out this bath remodel on a Budget, maybe you'll get some ideas : [https://www.houzz.com/discussions/bathroom-remodel-for-under-200-dsvw-vd~4475405?n=7[(https://www.houzz.com/discussions/bathroom-remodel-for-under-200-dsvw-vd~4475405?n=7)