fezzynessWell from what i've read, a dac has less impact than an amp on overall sound, and I'm really broke atm so I would only be getting an amp for now, and then getting a dac sometime in the future.
If I really end up needing a dac right away, I would probably try to get a super budget one.
derhpWell an hd6xx is a high impedance can, I would recommend this over the modi, and highly recommend you start saving up to really open the potential your 6xx has
derhpsave up for the system you want down the line. if you really need an amp to get by till then the cheapest route would be to buy a used stereo receiver from craigslist and just use the headphone output. they usually can be found for around $20 and you may find one that sounds really nice