Perhaps the first step is to determine your budget. Based on your budget, some bundles may be eliminated from the start. Note that if you can afford bundles, bundle prices are always better than buying individual libraries.
Another option would be to aim towards a complete traditional early to mid-19th century orchestra and then add color as needed from there.
As for small ensembles work: solo strings I, chamber strings I, woodwinds I, perhaps harp, perhaps brass I would all be worth considering. Depending on need, muted strings could come later. One point that has sometimes been missed regarding the strings: all string libraries are I: standard, II: mutes; except orchestral strings which are I: violin and viola; II cello, bass. There is a real sound difference between SE and the full libraries (though SE is very good). When purchasing full libraries, for realism, you will end up needing both the standard and extended portions for whatever full libraries you decide to purchase.