Man i've been using THESE speakers for literally 10 years. Not exactly a recommendation but i've seen people using PC speakers even(id recommend a $30 set of walmart computer speakers over the amp honestly), but thats just me. Use what you can, learn to work with what you've got until you figure out what you really want and can afford it. I would not recommend most guitar amps as most guitars put out something less than line level signal and the amp does the work. MPC is going to be sending a much hotter signal. If you have to use one just make sure you turn the amp all the way down before you plug in the MPC, then slowly bring the levels on both devices up making sure you aren't sending too much signal to the amp. It will take VERY LITTLE MPC volume to overdo it. Put it on a clean channel and try to EQ it as flat as possible. Just be careful, as you don't want to blow your guitar amp. again, i do not recommend this.
