80's System Needs Upgrade

After years of being too busy with family and business, my music listening was confined to convenience like small but decent office mini-system, and decent car stereo. I just recently dusted off my main gear (literally sat unused for years), and started listening again. I just also subscribed to Stereophile and Sound & Vision, and this website, now I want to do something to upgrade but in steps. My current setup is real old, bought in the mid 80's but everything still works exactly like new, except my kid snapped the stylus on my Blue Point cartridge about 10 years ago (see what I mean, never got around to fixing it until now). My ancient system:

1. Kef 104/2 Speakers

2. Denon POA-2200/PRA-1100 Amp/Preamp Separates

3. Linn Axis Turntable/Basik Arm w/ broken Blue Point Cartridge

4. Sony 507ESD CD Player directly connected to Denon amp thru built-in CD jack w/high cut filter (always sounded better than thru preamp)

5. Denon TU-600 Tuner

6. Onkyo Integra TA-2800 Cassette Tape Deck

Current plan is to move my Denon amp and preamp downstairs to run some ceiling mount Triad speakers (or equal) which I want to get for the TV room, just decent enough for good background music quality for parties. The preamp has a/v inputs so I could support a 2 channel sound system for the video, frankly more interested in the music than the surround sound thing. I can always upgrade that room's system to surround in the future around the Triad's. I'll use the Denon amp B speaker outputs for outdoor speakers for adjacent patio also.

Wifey has confined the KEF's to my home office (she hates speakers, hence the ceiling mount downstairs). So my current plan is to get a good quality used integrated amp for my Kef 104/2's. I'll also get a used phono cartridge to listen to my old 70's thru 80's vinyl, make analog tapes from vinyl with my Onkyo for the car and parties, continue to use my Sony CD player (I download and burn CD's at 320 kbps and lossless if available).

Sorry for long post, but what would you recommend for $1K to $2K used integrated amp as best match for 104/2's (best sound bang for buck)? I've seen/considered used Krell 300 or 400, DK Design VS1 V.3, Portal Panache or based on my situation and music sources should I keep the Denon separates for my Kef 104's and upgrade elsewhere first, i.e. would I gain appreciable sound improvements with a good integrated over my old Denon separates? Also any ideas on a used phono cartridge for about $100? This is probably a mid-fi to entry level hi-fi question but appreciate any advice from you hi-fi experts.