Rather than put your money into just forged pistons and not rods I would put my money into management. Only point in going forged is if you are going further with power, which is a good possibility once you take the first step lol.
You can run a TD04 at 1 bar on the stock ECU with an FCD and RRFPR, it will give you 200 easily, with an ECU you could get another 20-30 more without being aggressive on the map. You are going to need a clutch once you get over 200 so there is another price you need to factor in.