It doesnt matter how much travel a fork has, that doesnt mean it is going to be tall/short.
I can almost garentee you a pair of BBR sp5s are probably 2 inches taller then the Speed forks set at 5'' of travel.
SR6's are one of the longest forks on the market, and they barely level the bike out with the Perimeter frame.
The speed forks dont look much longer then stock forks, your better off getting SP5s then speed forks.
I highly advise you to get Marizochis or Stratos forks, not only because they'll perform 10x better then any other fork, they'll level out your bike as well.
This bike looks like it would sit about level on the ground with 12'' front wheel, forks ALL The way down into the clamps.
This bike sits about perfectly level with the Stratos forks and 12'' front wheel with forks slid pretty far down into the clamp. Almost all the way.