Not trying to twist your arm in any way. Be mindful though, in shopping for a quality Subwoofer, cutting corners is not a path to success.
Consider the LFE channel in HT contains information from as low as 1Hz, up to 120Hz. Chasing 1 Hz is foolish, as is chasing 16Hz.
(I chased 16Hz because I enjoy Pipe Organ. I do not regret it. But finding good Subs that are linear that low gets expensive.)
Looking at the options, and considering that this will be a cornerstone of a good HT experience, I only urge you to not fall into the trap which so many others do.
Skimping here will affect your experience for years to come. Finding the balance that's right for you and your situation, but that which also addresses the experience you will miss eventually if you underbuy now, is very key.
Mind, I'm not even trying to sell you on a pair of Subs! (I'm a firm believer here, but I already knew it was a non-starter for you.
)
Subs get tricky and many people hem and haw over which is the right one for them. I did this too. Most of the Subs we recommend are all known quantities and will satisfy for years to come. My only encouragement is to shop smart and work on finding the balance between performance and aesthetics. Involve your Spouse, too.
I f she knows you are trying to balance her interests and that of a good experience, she may (hopefully) surprise you and support going for something that will keep you guys happy for years to come!