Squeek sound upon acceleration from slow speed?? what is it??

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I have heard similar squeaks on other Boxsters:

1. Serpentine belt/ worn pulley bearings -no biggie
2. Water pump going south- biggie (possible engine overheat in near future)
3. loose spark plug (more of a chirp I think)- no biggie
4. Worn timing chain tensioner guides - A real serious biggie (motor probably would have grenaded shortly if this was not found and repaired in time)

I recommend you do not ignore this. It may be nothing, it may be everything.