I finally was able to make some additions in my audio setup. I just purchased the Sennheiser Momentum headphones and the Audioquest Dragonfly dac mainly based on the positive reviews from Assimilated and Mantis. I definitely want to thank both of them for taking the time to share their impressions with detailed and useful information.
I have not been able to spend much time listening to them this weekend but so far I feel they go great together and so far I'm very pleased with my purchase. I love the way the momentum's look they are smaller than I pictured but I feel it's a good thing since these are portable. They sounded really good out of my ipad but I feel they sound even better when paired with the dragonfly. I am mainly going to use this setup at work and the dragonfly is also going to be used at home for my desktop setup. Which is modded hd580s and a tube headphone amp and its definitely an improvement over the $30 Beyer dac. I also bought Deoxit gold spay to fix the contacts on my hd580 because it kept cutting out which looks liked fixed my issue very happy about that but feel stupid for taking so long to try it.
Anyways I just wanted to share my experience so far with the dragonfly and the momentum's I'll post again when I get some more time to spent using them. In case anyone is the market for either device crutch field have the momentum's on sale for 300 and was able to get best buy to price match and the dragonfly is $200 at the Magnolia.