Don't know what your parameters are, but if I was going to be moving and upgrading in a year, I would rather spend my money on the beginning of a better system. If you're renting for the foreseeable future, then it's a bit harder to do a 7.1.4 (full atmos) system and may not be worth paying for a receiver that can do that. Unless that's the ultimate goal and you don't want to buy another receiver for 15+ years or more.
Regardless, for a standard
future surround sound set up that you might buy, the receiver is the single most expensive item. I don't think tech develops fast enough in the home theater industry where waiting a year will get you any substantial difference in performance.
As for Soundbars, they rely on reflecting sounds, which may be good for a perfectly square room with a door that can shut, but for everything else, I get the impression they are mediocre. Similarly, for Atmos speakers, I've read that the ones the reflect sound off the celling are also rather mediocre, even when compared with moderately priced in ceiling speakers like ones from
Monoprices (I think those are the the ones that got high ratings for the price, but not 100% sure).
If you have an area to work and are even slightly able, you can get better sounding speakers for the money spent by building your own speakers. Depending on what you buy, all you need to be able to do is solder some parts and paint/finish wood. I built a pair of
bookshelf speakers fairly easily and I had only used a soldering iron a couple times previous to that.
As has been said before, it is recommended that you match the drivers (speakers) of the center channel and front left/right.
Parts Express has a decent selection of speaker kits with CNC cut MDF, where all you need to do it glue it together and finish it. Dunno much about the
Parts Express kits, so you would need to look them up individually to see what people think.
Parts Express also has a pretty good forum talking about DIY speaker builds. There are a few other places/forums around the net that people post builds too as well.