I watched Start Up (which I loved) and I loved the main couple. Any shows like this? Where both are on equal ground class wise and stay pretty much equal throughout?

Did you check the recommendation tab of Start-Up? There are good ones, including Fight  For My Way.

If you check the hashtag #LoveToHate you'll find several other series that have couples on equal footing, worth your time:

Que Sera Sera  - both are poor

It’s okay that’s love - both are famous because of their profession

The vineyard man - both are working at a farm

Fake Phoenixes - both are heir of the crown 

Under the power - both are police officers

Try:

  • Strongest Delivery Man
  • Miss Hammurabi
  • Where stars Land
  • Divorce Lawyers
  • Jao Sao Jum Yorm

By equal footing, do you mean financially?

I guess Long Vacation fits.  Both characters are neither rich nor poor.