[dubaifox]

spend the money on a portable HD recorder & a mic
& build you own library... imho much more rewarding
in the long & the short term...

I don't know.....

My most often required sounds are army's marching, buildings crashing, horses running, cars crashing/zooming, lightening and thunder, avalanches, planes zooming overhead and the like.

How are you going to record these sounds with a little field recorder?

In addition, if you are not recording your sounds with quality equipment, in the proper manner, on a sound stage, you are most likely not going to end up with much usable material.

Libraries are the way to go IMHO.