Since your looking for better sound sources and your title indicates Orchestral sounds you may want to look at these:

1-Garritan Personal Orchestra - $150 - http://www.garritan.com/index.php?option='com_content&view='article&id='154

2-Garritan Instant Orchestra - $150 - http://www.garritan.com/index.php?option='com_content&view='article&id='154

(Check PGMusic, I think they sell these)

3-Miroslav Philharmonik - $150 - http://www.ikmultimedia.com/products/philharmonik/

From here you can pay up to $1000 for orchestral sounds.

I don’t know what your budget is but these are some of the best in this price range. Rule of thumb for midi sounds, the more you pay the better the sound. But to extract exceptional sounds you have to get into midi. This includes all midi instruments.

I hope this helps and good luck.

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