That's my car's doppelganger right there. Great looking car, just do all the usual stuff, valve adjustment, purge, italian tuneup, fuel filters. The boost sensor and overboost valve like Engatwork said is often suspect. Check to see that no air is present in the fuel lines, replace leaky return lines. Perhaps tweak the ALDA a little bit. Your situation was just like mine, and I mean just. I think my car just needed to be driven out a bit, with a bunch of little stuff to help out. If it were my car I wouldn't rebuild a turbocharger until all the little cheap DIY stuff was out of the way. Then you might find out like me that it doesn't need rebuilding after all.

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)