Hey guys. I'm looking to upgrade my stereo system with a new receiver
(Denon AVR-1603) and centre channel (haven't decided on which one, but
perhaps a Paradigm CC-70). I'm already happy with my two fronts,
which are Paradigm Titans (v3). What I'm mostly uncertain about is
whether I should upgade my rears or not. Right now I have what I dub
"poor man rears", or in other words, they are speakers from an old
1998 hi-fi system. To be exact, they are Panasonic SB-AK45 speakers
with the following specs. They sound "adequate" but I really can't
decide if it'd be worth it for me to spend a couple hundred more to
replace them

Type: 4-way speaker system
Speakers
Super woofer: 17 cm cone type
Woofer: 12 cm cone type
Midrange: 6 cm cone type
Tweeter: Plezo type
Impedance: Total 6 ohms
Input power: Total 160 W (Music), Total 80 W (DIN)
Output sound pressure level: 84 dB/W (1.0 m)
Cross over frequency: 200 Hz, 3.5 kHz
Frequence range: 45 Hz - 22 kHz (-16 dB), 55 Hz - 20 kHz (-10 dB)

I guess my major dilema is that I have a major interest in audio
quality, and can really tell high end from low end. But of course,
I'm on a budget sicne I'm a university student, so anything that I
many not need right now I probably shouldn't spend on. Anyway I'm
hoping some of you might be able to tell me your honest opinion of
these specs as my current rears. Thanks!