Youve got some nice hefty riffs there and I dig the acoustic track alot.
If its just for home demos and practise riffs etc personally Id recommend keeping an eye out for something like a Line 6 TonePort, they dont make them anymore but can often be found cheap online, really easy to use. Amp/effects chain/cab simulators on it are decent (as simulators go anyway) and it comes with Ableton Live software iirc. The drum loops you can download to jam with are good and if youre using another piece of recording software with say, Drumkit From Hell, the possibilities are endless.
Havent been on it in a while but this forum always had great tips for recording metal in your bedroom, just search around it a bit