"Better" is a relative word. Yes, receivers with more features may be available but their audiable superioity might be questioned. Receivers made several years ago still sound pretty durn nice today. I'm still running a Denon 2802 made in 2003 and don't really feel I'm missing anything sound-wise. It doesn't have HDMI switching but that doesn't affect the sound.
So, the only real impediment by buying a full system now is that the wiring, particilarly to the rears, might be a bit unsightly if you can't hide them as you would in your own place.
But, whatever you do, if you're looking for a HT experience, buy at least the front three speakers at about the same time. They should be from the same make/line to assurethey match and there's no guarantee the line might change in a year or so.