roar,
Many decades ago when I left my parents house and moved into my first (and only) apartment I bought a bed and $2,000 worth of stereo equipment, a lot of money in the 70's
My logic is as follows. I NEEDED a couch, chairs, tables, etc. etc. so I knew that I would have to find a way to get them. I didn't NEED a stereo system and if I had spent my money on furniture there is a chance I would have never gotten the stereo system of my dreams.
I was single then and that served me well, I wouldn't advise it if you are married.
In other words buy the amp.
The subwoofer will follow.