Sorry to hear Robin, although by the amount of blow by it had on the PI trackday, it was evident that the motor was a bit tired, that's how mine was before I took it to Ben...
One thing for sure is that you will walk away a happy man once you pick up ur car from Ben's....
In my opinion. definetly get forged pistons, Ben recomended Arias 86.5mm for me which from memory were about $1350, mind you I was on a budget, the Tomei forged pistons are around $2k from memory...
Also change your headgasket to a metal one, I got 1.0mm Tomei... Obviously you'll get the block machined and honed to suit pistons, and obviously new bearings... Oil & water pumps can be upgraded to N1 items (recommended), unless you got the moola to fork out for a JUN oil pump...
Depending on budget and power goals, u could get some headwork and aftermarket cams... but then you ask yourself where do you stop???
This should give you a brief indication on what to consider with the rebuild, either way you'll have an indestructable fresh engine.....
I was gonna offer you good luck but you won't need it since Ben's doing the job!!!!
Cheers, sorry for long post