You have good plans for hours of enjoyable flying. When i made the transition from FS9 to FSX i had a hard time adapting, but it paid off.
My advice is before installing the scenery addons, try first experimenting with a few flights so you can adjust/configure all the graphic options to the most prefered framerate performance. FSX is way more resource hungry than FS9. I have unfortunately not tried yet any addons from PMDG, but apparently according to what i've read their addons (MD-11 and 747-400 for FSX) are not framerate killers, don't know how the 737NG will behave framerate wise. Once you decide to begin installing the addons wether scenery, aircraft or traffic addons, try it one by one so you can always compare framerate performance and adjust accordingly to your preference.
I have similar pc specs to yours and i have Traffic X addon installed and a lot of other payware and freeware scenery, airport and aircraft addons, and most of the time, framerate is good, except around busy airports.
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