HT upgrade- passive soundbar in limited space?
Hey guys! New here and am learning a lot but could use some help on upgrades. My current setup basically came with the house and I am looking to complement it. this is the living room with 14" ceilings, no back wall (open floor design) and pretty "bright" due to lots of windows my speaker situation 7.1: 4 ceiling speakers currently used as front and surround backs(I have not been able to figure out what brand they are yet) 2 in wall surrounds @ ~8 feet from floor (no branding on them), center is currently an old infinity HT in a box POS that I got at a thrift store (most urgent upgrade) and the sub is a 12" monoprice that is serviceable for the near future. The TV (TCL 607) is in a built in cabinet that has room for a soundbar or center either below or above the TV but no room on the sides for the front left and right. I am currently using an old pioneer vsx 811s AVR but that will need to be upgraded soon as well (any ideas would be appreciated). My goal is to get get a 5.1.4 (consensus seems to be that this is better than 7.1.2) system with a focus on the clearest dialogue in movies possible. my budget is ~$800 for center, front R+L and ~1000 for AVR but I can be persuaded higher if it makes a big difference.
the problems I see are that the cabinet limits my channel seperation anyway and that is why i am considering a passive sound bar but I am open to alternatives (I might be able to fit thin bookshelf speakers on their side below the TV if the center is mounted above but they would be basically on the ground then.)
things I am considering are( in price order) Canton cd 90-SB , Klipsch g-42, klipsch RP-440D, episode 500 series, DT mythos SSA 42
thanks for your help.