what to buy ... when the time comes

so i have been lusting for the tamron 28-75mm 2.8.

however. i was browsing flikr and came across a comparison of that, with the 17-50mm.

i already own a 50mm, however i love the wide angle end of the 17mm.

here is the link for the comparison: CHECK THIS OUT PEOPLE :)

now im torn

however it comes at a good time.

why?

because i am not ready to buy just yet! darn. but saves me the stress at the moment.

i know the 28-75 is popular - but gosh that 17 end looks really nice!

any thoughts anyone wants to share?