That is kind of funny.
My first real system was the NHT SuperZero bookshelf speakers x 5 + a SW2P subwoofer.
After 10 years, I sold them to my little brother and got the DefTech BP7000SC system.
All the marketing BS (from DefTech) aside, I think DefTech makes great sounding speakers, and so does NHT.
Unless you get the BP7000SC or the RBH T-2P speakers, you probably want a dedicated subwoofer - unless your taste in bass is very mild.
For example, my brother thinks the bass output in the Infinity P362 is all that he ever needs.
So, of course, to my brother the DefTech 7002, 7004, & 7006 will have all the bass he ever needs; he will never want a dedicated subwoofer.
What is your taste like in bass?
When you watch Iron Man 2 on BD, do you want your entire body to shake like an earthquake?
If the answer is yes, then you need a dedicated sub.
If the answer is no, then you do not need a dedicated sub, and one of those DefTechs with built-in subs is all you will ever need.