I like to use old wood a lot and will harvest it from just about any source available ; pallets, barns, vegetable crates… you name it if its weathered and available, I want it. These two saws I use daily. The Skil saw is portable, very accurate and makes clean cuts in 3/4" boards up to 15" wide. I buy full sheets of plywood and have the store roughcut to 12"X48" (less than $1.00 for the cut). Then I can cut it to the size I need at home and cut around blemishes.
The other saw is a Ryobi oscillating tool. This is one of the handiest tools to own. Equipped with a carbide blade, you can quickly and cleanly harvest any board by cutting the nails or screws.
I keep an 80t trim blade on my cordless Ryobi circular saw, and throw it in the car when I go buy material from the big-box stores. I cut sheets on the cart in the parking lot.
I have the Vibsaw in DeWalt and it is something I use once in a great while but when I do it beats anything else I have.
As to the floor, cutting saw, I think you will be disappointed in its lack of versatility as you branch out. But then again, if you don’t branch out it may serve you very well.
I have a portable table saw and some rolling material supports, but no really stable infeed/outfeed tables, so when I’m dealing with large material that is too awkward for me to safely run through the table saw, I law the material on the floor, on top of some 2x4s, and use this circular Skilsaw with a Kreg Rip-Cut. Works a treat!
I use one of those a lot, if you want a square hole it is hard to beat. Also tongue and groove, and handy in reducing the volume of scrap to mostly material instead of mostly hole.
