Haha its not that big, its just taller.
W H D
279 333 407 Lian Li Q08
250 404 359 Prodigy
220 295 354 SG09
I suggested it cause:
1. Portability (has 2 large flex handle on top and bottom for carrying.
2. Open interior for airflow and larger components.
3. Ease of repair (moving computers can be risky business)
4. Cable management is pretty easy with the case if you get a small PSU.
5. Decent build quality.
It isn't a bad case in any way, its larger than a traditional mITX case for sure. But it also allows you to basically build anything you want into the case. I've seem some crazy liquid cooling builds in a Prodigy. Also you can fit larger radiators in the prodigy, for better OC'ing of your CPU. The prodigy can hold full sized graphics cards as well. I've seen several fitted with GTX690's with little effort.
That said, you were asking for recommendations on a budget. The Prodigy is fairely inexpensive and has a decent following because it allows for a lot of flexibility. I'm sorry if my suggestion upset, disappointed, or frustrated you.