Apple Logic Pro /LogicExpress Discussion

Hi guys....hoping you can help!

I'm fairly new to Logic (and audio technology generally!) - but I'm geting to grips with 
creating songs using the software instruments.  But I'm now at the stage where I want to 
expand my library.......can anyone give me some recommendations.  I'm using mostly 
orchestral sounds - but can't afford the HUGE libraries (like Vienna etc etc).

Where should I begin!!!