I found the
manual for the 2235B here.
I know you said you don't plan to play it very loud, but that receiver is only 35W per channel rated at 8 ohms (the 4 ohm rating will be higher, but it's not stated). The manual says to use 8 ohm speakers when connecting two pairs, so it should handle 4 ohm speakers in a single pair but I would lean towards 6 ohm and 8 ohm speakers with old electronics. With lower power amps you need to take speaker sensitivity into consideration. Higher sensitivity will produce more volume at the same power level. Something probably in the 89 dB per 1W @ 1m area and above.
The Polk Legends are great speakers, but the L200 has a sensitivity of 84dB and they recommend 80W or more of amplification. Might want to see if
@shadyJ jumps in on whether the L200 is appropriate for that receiver. Any decent bookshelf or tower can be appropriate for 2-channel music. A home theater speaker would be more along the lines of an on-wall or in-wall to mount next to a TV screen. Plenty of people using ELAC and Buchart bookshelves for music and they are not that big. The L200 does go down to a respectable 46Hz (extension down to 36Hz) which is deep for a speaker its size.
The Philharmonitor is in the same boat. Sensitivity around 84 or 85dB and likes 50W plus, so 35W might be stretching it if you want higher volumes on occasion. It also has pretty decent bass for a speaker its size.
It is fully reviewed here. Which company is close? If it's Salk, they also have some great slim towers, both sound quality wise and finish. I would definitely pay them a visit for some listening sessions if you can.
With a tower you will typically get more bass extension which will be a plus if you don't want to add a subwoofer. The Paradigm Premier 800F for example goes down to 43Hz with extension down to 27Hz. It has sensitivity of 92dB so will work well with less amplification. Knowing that you have the 2235B might change some of the speaker recommendations from others.