Pioneed by far makes better head units, I have had 2 of them myself, due to wanting more features I had to upgrade. And more features i got alright! and i've had it for over a year and a half before it got stolen. The first one was bought in the year of 99, at wal mart for 202.21. it is still going great in the girls car i sold it too to this day. and still push just as much power and still looks in great condition.
Now I don't know bout this blaupunkt, but I've really not been convinced that they surpass pioneer in elctronics, their new head units may be around the lines of pioneers older headunits, like before they got their graphics into them.
But is cost is a issue i'm sure the blaupunkt will smoke it in price, but you may be sacrificing some quality and features that are almost becoming standard on all pioneers now. You know like (Supertuners, extremely accurate eq's, sub controls are cool.) Not to forget the mp3s or the organic display.
anyway seeya
Brandon