Splenda all the way. I feel like there's some funky taste to Equal...I don't know, maybe it's just me. Either way, make sure you aren't getting super liberal with it. Moderation, baby! Maybe try a flavored coffee? Or better yet, switch to herbal tea! Green tea has a thermogenic effect and might help you burn a couple extra calories....and it has a lot of other great benefits.
However, if you choose to stick with the coffee, I read a study the other day that says drinking a cup or two in the morning might also help to boost the metabolism because of something in it (caffeine? I don't remember honestly, I don't drink coffee much anymore since finding herbal tea)
Either way, I'd keep your habit. Any warm beverage is an appetite suppresant because it makes the stomach expand.
Just cut back on that sweetener!

Love and luck,
becca