The RePacks have pretty much all the best stuff compiled in them, so if you're just getting started there's no better option. You're already getting a better experience than the base game
That said, you can ALWAYS have MOAR MODS, so keep an eye on the
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thread. Most of the hotfixes, updates and overhauls that
eventually make their way into the repacks can be found there, but there's also a lot of Studio props, maps, clothing, hair and body textures that don't get added.
Make sure to add any zipmods you might want to download and try out to the Mods>MyMods folder. Placing the mods you find in here will protect them against being overwritten when the RePacks get updated
Any other questions, let me know