Hi, I bought a new pierberg off e-bay for under $300. I've had it in for about 10K miles with no problem. I cannot comment on the pierberg/hella relative quality; the pierberg is definitely well made.

FYI, you will probably get a little notice of failure, I did; you will notice locks get a little suggish and you lose power assist in your brakes. You will not notice any particular noise from a failing pump.

One word of advice I can give is stay away from the Chinese pumps, if it's less than $200, it's Chinese. A good used new style pump may be an alternative if you are looking for a bargain.