Minimal cost and does what I need it to. Mostly 2d stuff for CNC cutting.
Look at Plate 'N' Sheet for sheet metal development. Not actually a CAD program, but does the development which you then import into CAD.
I've never cut Hardox with mine so can't comment on that. I think the general rule with holes is that the diameter needs to be at least twice as big as the metal is thick to get something like a decent hole. I have been known to plasma the hole to get the position and then run a punch through it...
Mines a SwiftCut. Tis about 7 years old now and not been a lot of bother really. A few niggly things to begin with which were sorted under warranty but it generally behaves itself as long as its maintained.
Just 115mm and 230mm I'm afraid. I tend to only stock what I also use myself and then I don't get stuck with anything if it doesn't sell. I did look into 125mm cutting discs a while ago but the was not enough interest to make it worthwhile to be honest.
That's the SP set I have, bought it in an auction years ago for £50. Was smiling all day as in my mind i would have gone much higher!! Without doubt one of the most handy things I own and a select few quite often borrow it from me on the basis if they lose or break anything, they replace it.