garritan has some decent strings/orchestra and choirs for very few bucks.
It’s not Vienna but it gets in the neighbourhood of what the real things do and the samples are a bit different then most. There are some very interesting patches.
Steinbergs symphonic orchestra is not 300 pound but rather 99 i would think, and if you wait out some weeks there will be the annual half price promotion and then it’s only 50 pound. By far the best option.
Or you could try KVR to discover a wealth of options just for free:
https://www.kvraudio.com/q.php?search=1&q=strings&pr[]=f