Don't go for the mini bows ;-; The filter is HUGE for the tank, and takes up about half the space. It's also very harsh, and was pulling my betta everywhere. I agree w/ 1f2f, go for the walmart kit. The plain old rectangles actually tend to look better than the mini bows.
i agree with the rectangle bit, but in all honesty it's your choice, i dont know if it's helpful but petco has a sail on tanks right now you can get a ten gal for ten bucks, i was told that the 'dollar a gallon' sail only applied to ten gal and up, and you said 5 gal, but it's still a good buy considering.