I'll also mention the Monolith THX-365C 3-way center, which is $400, but often on sale for $350.
Interestingly, it is a sealed design and uses a dome midrange, both like your ADS L1590.
As a side question, have your L1590 had any crossover or driver work?
They were the TOTL towers from ADS from the 80's, IIRC, but they might be able to use some refreshing. There is a guy in AZ who is "The Man" when it comes to ADS speaker refreshing.
5.1 and 2.0 ch: Marantz AV7704/Emotiva DC-1/Rotel RB-1582 MKII/Audiosource Amp Three x 2/Polk LS90, CS400i, FX500i/Outlaw X-12, LFM-1/JVD DLA-HD250/Da-Lite 100" HCCV/Sony ES BDP/Sonos Connect. DC-1/RB-1582 MKII/Sonos Connect also feed Polk 7C in garage and Dayton IO655 on patio. 2.1 ch: Denon AVR-2807/Klipsch Forte I or NHT SB2/JBL SUB 550P x 2. 2.0 ch: Outlaw 975/Outlaw M2200 x 2/Klipsch RF-7 III/Sony ES BDP/LG 65" LED. 2.0 ch: Klipsch Powergate/NHT SB3. Kitchen: Sonos Play5.