IMO, unless you are truly a n00b, rim-weights in the 70's are a waste of money.
If you can throw 130+ with a 70%, you can easily throw 150+ on the first throw of an 80%+ discus due to the better, more solid feel, and better flight characteristics.
I'm just talking from personal experience. The jump from an Obol 70% to a Saturn Pacer II in the lower 80%'s changed my throwing BIG time. I wish I would have done it a LOT sooner than sectionals Senior year. We were a private school with $0 funding. I had to buy the Obol myself, and borrow the Saturn from a competitor who didn't make Regionals. This was ten years ago.
I just bought a Stackhouse Indra, by the way. 93% rim weight.



I have been throwing an OTE VHM 85%..