You need to list a budget that you are willing to spend on the subs, what amp you are intending to power them with etc.
With what you listed as requirements you're leaving yourself open to a huge variety and really not narrowing down your options. You want " tight, clean, loud". Remember that everyone's ear is subjective, one persons idea of clean is not the same as others.
Loud is dependant on power, box, cabin gain, cone area etc.
tight, are you referring to a sub that has a hard hit, can continually hit that hard note, etc? Something that'll excel at hard rock?
Clean, my opinion is that this is based on the box design, and install mostly. Obviously a poorly designed woofer will sound like poo.
You want the ability to get loud, look at our Nuclear and Plutonium lines. They'll take a ton of power and sound excellent in doing so.
You want affordable and loud, look at our Radioactive SPL subs, they're quite affordable.
I always take more surface area when it is an option. 2 12s as long as all else is equal.
You have some decisions to make before buying a sub. Try to identify your overall budget, what amp you want to use, whether or a sealed enclosure guy or ported, etc. this all needs to be taken into account when you choose a sub.
Good luck and keep us all posted on your choice.