Dual Action Sander, bang for the buck

I've got a good quality 60gal, 5hp, two-stage compressor that puts out more than the local *****, so I'm good there. Not for commercial use, just my Cuda for now but I don't want to be screwing around with the tool when the time comes. The one on Amazon looks good enough. It's been a while but I did a dozen cars with my Dad 30years ago, so I'm familiar with the process. We did it mostly manually back then and I'm not up to that anymore. I picked up a good inline board sander at a garage sale. Last thing I need is a 3 or four inch with a semi-rigid pad for dressing welds.