Rogue Rebalancing, Song and Silence, and the Expanded Thief's Stronghold mods gave me a great time with an all-thief and Bard party.
Sharpshooter, Swashbuckler, Soul Knife, Blade, Jester... The possibilities are endless
I ofund it quite fun, as I pretty much had every single role, sans magic in one party. But once I got the UAI HLA... well, I had a semi-cleric, and a semi-mage, if you know what I'm talkin about