You can't just go for the best bang for the buck. You need to stick with the center speaker of the same brand.
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IMO, the center chnl should be the exact same speaker as the front L/R. If possible, all three fronts should maintain matching tweeter heights. None of the center speaker being placed several feet higher or lower than the mains, causing tonal "panning" issues.
The theory (THX) was to obtain narrow width from the center audio chnl, but pending domestic screen/seating position, most of the so-called "Center-Chnl" speakers with woofer-tweeter-woofer driver arrangements, are subject to substancial frequency roll-off due to limited off-axis responce in the horizontal plane. They work great in the vertical axis (limited height with full imaging width), but suffer greatly if listening +/- 10 degrees off center in the horizontal. Check the speaker specs for dispersion "windows".
Several big recording studios using ATC, B&W, JBL, etc. use this approach, along with tons of larger "projection" home HT installations. Don't be fooled by articals claiming the center chnl is limited to dialog only. Tons of media now incorporates full bandwidth through all 5.1 chnls. By right, the ultimate would be 5 or 6 matching full bandwidth speakers, providing you can position yourself dead center, and your room's accoustics are evenly balanced for speaker voice-matching.
Many feel that CC speakers are just another marketing ploy, generating serious $$$ in sales off the uneducated masses. Look at all the HT brochures/articles/etc, depicting the CC speaker placement. What's wrong with their placement?
Also, if your main speakers are fairly close to the sides of your video display, and you're seated between the 45 and 60 degree speaker listening angles, many experts will agree that you shouldn't bother with a center chnl providing the main L/R image well enough. Once video display sizes get to past 6 feet wide (speakers at 7 feet apart or further), then it may become a substancial improvement. Oh, and merely spacing the mains wider apart to justify a CC, only creates issues with "over-pan" where sounds overshoot the screen's edges, while the jet still remains in view.
Just setup your proc. with the center chnl turned off. Try this first before spending more money.