I'm primarily a guitar player, but am getting myself into a situation where I'll need a workable live bass rig. Looking for recommendations on a Class-D bass head. Already have a great cab. Looking for the ideal combination of small / light / power / inexpensive. (Yes, a tall order). The contenders are: - MarkBass Nano Mark 300 http://www.markbass.it/product-detail/nano-mark-300/ - TC Electronic BH250 https://www.tcelectronic.com/product.html?modelCode=P0BRP - TC Electronic BQ500 https://www.tcelectronic.com/product.html?modelCode=P0CQS - Ampeg Portaflex PF350 https://ampeg.com/products/portaflex/pf-350/ Please let me know your thoughts and recommendations. THANKS..!