Personally I’d go for a cordless reciprocating saw instead of a grinder. They’re easier to use, safer, similar cutting speed, similar price.
Get the 125mm version, the extra 10mm makes all the difference Seriously though, I've been upgrading my grinders to 125mm, it's often just a change of guard. The discs last a little longer and give that extra depth of cut, often just enough to save reaching for the 9".
For cutting stone, yes, I agree but I'm not aware of any diamond blades suitable for scafflold tube.
Before you buy Pitlamp have a chat with Mr Lister he is using a reciprocating saw to good effect on the other side of ink and it's much safer than a grinder, I think the blades last longer as well.
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