Will a new DAC make an improvement in sound?

My present DAC is a 5-6 year old Stellavox ST2. Online at http://www.stellavox.com/st2.html

My question is, will I improve my sound noticeably if I buy a newer DAC such as the Benchmark DAC1?

I have a good system, Avalon Eidolon and BAT electronics, so if there is a decided difference, I would be glad to hear it. Plus the price of the Benchmark DAC is not too formidable, which is a big plus.

Any opinions would be appreciated.

thank you