I have Garritan Personal Orchestra, and if it’s anything like instant orchestra it’s not that much better than sonatina. It is better than sonatina but still suffers from the same main problem, that there aren’t enough articulations.
The really good libraries are going to really, really cost you. However there is this:
http://www.soundsonline.com/composercloud
Which I currently subscribe to and highly recommend. $30 a month is actually really freakin cheap compared to what it would cost buy these out right. Make sure you can afford it, because you have to commit to a year. But a year subscription still costs less than buying 2 of the 7 you pick out right, and you get to add one to your 7 every 3 months.
The best ones to pick are the Hollywood series, which leaves you 3, which I went with choirs, pianos, and stormdrum.
edit: I did want to add that you need a fairly decent machine for East West. An SSD is practically a must to store the samples on, because they’re too huge to just load them into ram so it streams them from the disk.