Here's a good set for cabinet building:
This is an excellent flush trim bit. No cabinet builder should be without one.
This is a good all around bit to have. If you have a set of template guide bushings, this bit will be used a lot.
This is another general purpose bit. I use this one to hog out joystick recesses for happ sticks. Very good bit to have.
You'll also need
this and
this if you plan on using t-molding (which you should, t-molding rocks!

).
A couple of bits that will round out your collection nicely are a
1/8" roundover bit and a
chamfering bit.
This is a great starter collection for an aspiring cabinet builder. Most jobs involved in arcade cabinet making can be accomplished using these bits. You can add to your collection as new jobs/tasks come up.
The place I linked to is a great source for whiteside bits. Use the code woodnet10 to get 10% off your order and shipping is always free. Great source. The discount plus free shipping beats anything routerbits.com can do. The set I just listed above comes to a total of $96.08 after the discount. Expensive it seems, but these are super high quality bits and worth every penny. You can omit any bits you won't use right away (maybe you won't need the chamfer bit or round over bits right away; same with the 3/4" straight bit). The bits I'd recommend getting up front are the 1/2" straight bit, the flush trim bit, and the slot cutter and arbor. The others can be added as needed. Since shipping is always free you don't have to worry about trying to get a bunch at once to save on shipping. The bits I just mentioned come to a total of $46.83 after the discount. Much more tolerable. Next I would get the chamfer, then the roundover (very useful general purpose bits), and then the 3/4" straight bit. Then fill out as needed.
Since you're new to routing I highly suggest getting
this book. It's more of a router bible than a guidebook. Everything is covered in it. It's presented in a straightforward manner so that even router noobs can understand and learn from it. A lot of what I know about using a router was from this book. 11/10.
One more thing, what router are you planning on getting? I ask because a poor quality router will result in poor (not to mention dangerous

) cuts even with good bits. Since you seem to be on the right track in selecting whiteside routerbits, you should do the same for your router.
This one is an excellent router to have. Super smooth running and plenty powerful. The extra accessories included are very nice, especially the edge guide. I have this set and love it.
This is another excellent choice. It's even a bit nicer than the bosch IMHO. I have this one as well and like it a bit more than the bosch, but given the extra accessories and the $25 lower price, the bosch is probably the better deal at the moment. You'll be happy with either.
Hope this helps a bit.

Lew, with the discount and free shipping the whiteside bits from holbren are around the same if not a bit cheaper than MLCS (which are good 2nd rate bits; not up there with Whiteside, CMT, Freud, but good for second rates). With the whitesides being higher quality than the MLCS bits (by far) I can't recommend MLCS as a source.
rdowdy95, no cookie sheet necessary. Just keep a good grip on that router.
