Congratulations on the new arrival!
Internals on the TDi are strong. Easily push 200bhp without any problems.
With a TDi; injectors, turbo from a PD, intercooler and a map you should be able to get at least 150bhp.
Mine's certainly not sluggish, even for an estate and all I've done is uprated SMIC, injectors and chip, it's torquey as hell. I've only spent £180 on the engine.
I'll get it on the rollers at some point to get a figure.