Need some sewing machine advice

[Fluxion]

For those of you whit hit other forums I appologize for spamming this post but I'm running out of time. I'm heading out to an auction at a local auto upholstery shop tomorrow and there are 5 sewing machines. I have always wanted an industrial sewing machine for various projects including my own car upholstery. I was wondering what these would be worth?



Here's what they have at the auction:

2-Consew 206 RB 3
1-Consew 206 RB 4
2-Juki Lu 562

The other question would any of these three models be suitable for sewing Leather that is thicker than normal upholstery leather like 6-8 oz? You know like for knife sheaths. Just trying to cover more than one hobby with a new tool. ;)