I find the best thing to do with an asp x is to boost it straight into a high metal content world watch it explode and buy a decent ship that doesn't make fart noises when you fly.
But that's just my opinion of course.
Then try a DBX. Its cheaper and has a similar capacity of modules to fit most of the things you might need. It also has the second best jump range in the game (though it can't fit a big fuel scoop).