download and install a custom ROM and you can get root and stay rooted with cwm... I strongly recommend my ROM (n00b ROM) as a starting point, it's a ROM with NO issues and all the goodies available as far as functionality with the smallest footprint of any ROMS right now.
there are other good ROMS for this phone that would do the same thing but I am biased
I believe there is a file on the phones put there by boost now that tries to keep the stock recovery, not sure where it is on the phone, but you have to delete that file so recovery doesn't get written back to stock when you reboot.
Or just flash a custom ROM