It is a good deal, but is that what you really want? You know how we tell people to get the best equipment they can afford right off the bat and not to rush things? In the spirit of that advice, may I suggest that you get the tank that you truly want. It might be a little more expensive and take more time to do the rimless pico, but IMO it would be way cooler, more unique, and (knowing you, haha) will provide more options for customization.
I remember saying that the BeanAnimal overflow was the best investment I made on my tank... I said the same thing when I bought VorTechs and LED's....I might say the same thing about my CaRx, too. What I've personally learned getting ready for this upgrade is that the best investment I've put towards my hobby is patience and diligence. It's unrealistic that I get everything at once since I have to move twice this summer, but picking up a few things here and there while not hurting my pockets is so lovely. I know that when I get around to setting up the tank in August or September, I'll be setting up the tank that I want. I've been collecting equipment for this upgrade for over a year now and just used it on my 125.
We've been in the hobby long enough to know what we want out of it and that (most) compromises don't satisfy us for very long. Just my $0.02, but unless that biocube is the dimensions you want, with the coral/rock/sand that you want, and equipment that you want then why get it?