Thanks for all the replies! Today I´ve found a very cool and simple freeware VSTi called ShortCircuit. Here´s the link if anyone was also looking for something like this: http://www.vemberaudio.se/shortcircuit.php
From the screenshots it may look complex, but 99% of the options there are just filters and stuff to use if you want to tweak the sample.
ps: The 1.1.2 version is the best.
yeah grizzly is another one but i never got it working on my pc, think the file i got was currupt.
Only heard good things about shortcircuit- does exactly what you need, lets you load up samples and trigger then with midi. perfect and free!