If you have a chance to try some friend's/competitor's 8-shot models see which platform you prefer (9mm or .38). Add up the cost of the mods you'd want to make, including reloading gear if applicable, and see if it'd be worth it to you to make the switch. If you decide it's for you then shoot what you've got until you can save up the cost of making the jump. Be honest in evaluating your skill level as to what difference you'd see in the results as well. Either way, by all means, have fun!