Think about something in the Roland line with an Orchestral expansion board.... one for the XV models. There were three for the JV series Orch1, Orch2 and a Vocal board.... all three are contained on the big Orch board.... also there is an expansion board devoted to strings and string articulations.
There is also an Orchestral DXi by Edirol...... they do have a pain in the butt "inset CD now" when you boot the soft synth.... but I've heard good things about the sound.
There are lots of sound fonts available for free.... the Sinfonia sound font is devoted to orchestral samples and a search will turn up lots more... including, as stated above some fairly cheap EMU orchestral samples that were considered pretty darn good about 10 years ago.
Finally, there are a number of software (and hardware if you have the money) samplers out there. By buying one of them, you can either 1) add specific samples as you need them, or 2) buy the most expensive samples you can afford now and upgrade later. Samples can go for $99 for a disk full to thousands of dollars. This does presume you have a computer... if not, try the Roland.
Take Care