There are doubtless many options that would get you by, but if you provide some more information it could help in making sound recommendations.
How thick is the aluminum, and what alloys?
What are minimum and maximum depths of cuts?
What are the most important qualities, tool life, fastest cutting speed, the smoothest finish possible, or tool price? I know is nice to have it all, but you usually need to compromise at least one factor.
Will flood coolant, a mister, or air blast be used, or does it have to run dry?
What rpm is the motor, and is it adjustable? Assuming the rpm is high, carbide is likely the best, if not only, logical choice.
What size(s) would you like to use, and what sizes can your machine accept?
I don't know how they (your router) will hold up, but I can tell you it could be very much dependant on how heavy you load it in the cut, and whether you can run without chatter (or at least heavy chatter).
Your optimum feed rate (or chip load) will depend on many factors, such as work piece rigidity, machine rigidity, rpm, horsepower, depth of cut, type of cut (slotting versus light profiling, or shallow engraving, for example) if and how much coolant is used, and etc. Also, the specific tool will make a very real difference.
Sorry I didn't spit out absolute numbers and specific recommendations, but it would be hard to do that without more information to go on.