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Will I be able to get flash et al working in firefox (64bit --added)
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Suse 10, Yes Sir!

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Do the win32 codecs work ok with 64bit?
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Yes Sir!

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What are the pros and cons?
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You will find that there are more apps/rpms initially available for the x86 version than for the x86-64 version. However, the x86-64 version will catch up, plus, you can always build/compile your own.
An example is klamav, I'll bet the rpm is on the 32-bit apt site; it's not up on the 64-bit apt site. No problem, search this forum for klamav & there's a howto to build it for x86-64.

I have heard that modems are sometimes a problem, but loking thru Yast, I saw an rpm for smartmodem.

One good thing is that a 32-bit Suse will run faster on a 64-bit box; a 64-bit suse = about 20% faster than that.

On my x86-64 desktop & laptop everything works with suse10. I sometimes have to come to the forum for help with an app, but these fine folks here will bend over backwards to help you out.

If you have the disk space. why not try both? The install will pickup & setup a dual, tripple, etc. boot with no problems.

If you do go with both, my bet is that you move to x86-64 in a month or two.

Have fun