Since I want to use loops in future material I got me the Koala software-sampler for iOS last week. Works on iphone and ipad, can record direct or load samples. Basic functions are cutting to length, looping, sequencer and a couple of effects (verb, delay, stutter, dirt, etc.), which can be reached in "performance"-mode. Time-stretch and other features can be unlocked via in-app-purchase.
Got no experience with hardware samplers, so this seems like a really good starting point. And 3,99 EUR is just right to experiment.