Everyone here will have their own opinion on diet. There are alot to choose from and I doubt anyone will tell you "this is the best", as they all have different pro's and con's.
But for anyone just starting out, I recommend the HPW Complete. Reason? You just can't mess it up :-) You simply add water to the powdered staple and that part is done. No supplements to get wrong or ratio's to figure out. It's harder to mess it up enough to be unhealthy as compared to the other diets. (IMO)
Also, with this diet, although it comes with a very easy to make veggie/fruit mix you can make and freeze; you can use pretty much any fruit and veggie you want to serve with it. This gives you the opportunity to get familiar with the ratio food list.
I'd say, use the HPW Complete for a bit and get familiar with the food charts, how they eat, and what the like and don't like etc. Once your more comfortable making your own choices based on the things you've learned in the mean time, then you can decide what's best for you and your suggies.
Something to consider. No matter what you feed, they aren't cheap pets. Or shall I say, I manage to spend more on my 5 tiny little suggies in a month than I do on my 280 lb dog.
I'd say have your work/school/social life "figured out", as they have their schedule, and get to the point that your finances allow you to set aside 100$ a month as extra.