I'm trying to do the best I can to monitor and mix my own stuff with a really low budget. I can't afford more than $200 right now, and I'm working in an untreated room. Through craigslist, I have the choice of a pair of Mackie MR5s or a pair of Sennheiser 598 headphones. They're the same price. Any recommendations? By the way, this is for the short term, while I work to save up for room treatment and some Adam A7s. In the meantime, I need decent mixes.