hey poor college kid here, I've been running in nike streak 5's for the last two years. (I know I run in flats, but Im uninjured and if it aint broke don't fix it). However, now the only streak 5's available online ebay $110 "never seriously worn, used" pairs, and while I've gotten "like new-used" pairs before it's been a mixed bag. I'm considering moving onto another shoe altogether as every shoe eventually near-impossible to find. So, what are your suggestions for someone who ran in streak 5's? Are the streak 6 and 7's comparable? What about the adios 4 and 5's? I hear the 5 is a disappointment and not like 4, is this true? I've tried on the Saucony Fastwitch and run a bit in the Brooks Hyperion Tempo, but neither are for me.