Bifold and Sliding Closet Door Quality

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I'm rehabbing a 4 BDR with small bedrooms and am replacing all the doors, including the original 1970s closet doors. 3 of the bedrooms have small single bifold closet doors and one bedroom has a double set of bifolds. I'm planning on replacing the double set with sliders. I'm going with the six-panel look to match the new six-panel bedroom doors, which will all be painted white. The quality of the premolded bifolds and sliders at HD has me concerned. They seem hollow (because they are, I suppose) and cheap. I'm worried they will appear dented or bent by the time I get them installed and/or get the knobs affixed. The end buyer is most likely FHA first time home buyer, spending $200K max for a starter home.

Is there a mid-range quality option I can buy elsewhere? Something more solid?