I hightly recommend rooting anyway. I used z4root, myself. Easy peasy! One-tap rooty! I only just restored back to stock--I don't trust any of the ROMs out there yet, since they're all in alpha (or even worse) state right now. Although, for your sluggishness, have you looked into what's causing it? Eliminating the root cause might be better than flashing a new ROM. Slow downs often happen when there's apps competing for memory at the same time in a multitasking OS like Android, and memory management isn't always optimal by default. You can manually free up unused memory by holding down the HOME key, tapping on the task manager, go to the RAM manager tab, select level 1 and 2 and tap 'clear memory'. Not a GREAT solution, but just something to try out to help narrow down the cause. If you're going to be rooted, be sure to check out V6 SuperCharger--it might help speed things right up by providing better automated memory management settings for the OS.