The plug ins that come with FL should be more than effective enough to handle that job.
But if you're looking for separate VST's that basically perform the same functions
you should check out the plug ins for reaper. They're given away for free by the creators
of reaper and are available for download on their website. REAPER | Audio Production Without Limits
You should be able to find a link to the VST's somewhere on there.
Either way FL comes with it's own standard plug ins that should
offer similar functionality.
Fl Studio already has built in plugins for mixing your beats .
Like Parametric EQ 1&2,Fruity Compression,EQUO,Fruity Limiter,Maximus and many others.
But if these don't satisfy you you could easily download some more plugins.I recommend Izotope products.
And mixing in another DAW won't matter..it's about if you know how to mix the beat that matters. Good Luck.
As FL Studio supports VST plugins you can try the iZotope Ozoneplugin. This comes with a lot of presets that can be used to master your final mix or individual instruments tracks.
Nothing more is needed than the channel strip effects, one of the EQs, possibly the MB Compressor, and the Limiter included in FL.
Anyone who actually knows how isn't relying on the exact same tool from a different company UNLESS there is something very distinctive they want out of the specified tool.
They even guide you on how to chain and use this stuff on the pages, wow.
I compose in FL Studio then track out and mix in Cubase 5. I often use Izotope for minor tweaking but i usually just use the factory Cubase plug-ins for eqing, delays, reverb, etc.