Hi Rikki
The key word is sound source. Garritan and Hypersonic 2 are sound sources superior to the vst's in BIAB. I think both are great for your purposes. Afterall, some of the other performers on the forum use them.
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pa4X 76 ,SX900, Hammond SK1, Ketron SD40,Ketron Event X Centerpoint Space Station, Bose compact