WHICH ONE TO BUY?

I am new at this. That said - I just purchased a pair of mint, Dahlquist 30 speakers. I like them a lot. But I have an ONKYO 80 watt receiver, (purchased somewhere around 1995) that is not 4 ohm stable - and these speakers seem to want a lot of power.
I would also like to add a powered sub; and the ONKYO does not support a powered sub.
I usually play music. But I also use this for home theater.
I really do not care about surround sound and other types of home theater sound processing. However, I really need a remote. I also have an IPOD dock that I play via the aux input.
Does anyone have a recommendation regarding what to do:
Should I buy:
- an amp and preamp?
- or a 4 ohm stable, multichannel receiver for home theater? Is there such a thing?

OH, and one more thing. I have two kids in college, living the dream. So, an indication of cost would also be helpful.

I really appreciate any, and all input, as I am really confused. I am not even sure what questions to ask and how to problem solve this.
Thank you everyone in advance,
Bill