How much do you want to spend? I would get the AG-30 ( I did in fact get the ag-30 ) from Guitar adoptions at $189.00 this amp is super clean and sounds awesome!
http://www.guitaradoptions.com/prodcat/cus...&cat=261&page=1Check it out! Read Lil' Brother's review of ultrasound. I heard my first ultrasound amp with John Standefer who won a fingerstyle championship in 2002. The amp is super quiet and the sounds are incredible...
Best is that the shipping is free.