Trade-offs...
...first, a little background, so you know from whence I come...
I'm into stereo...IMHO HT is what has caused the ruination of reasonably priced two-channel gear...sooo, with that in mind, I'll continue...
You are currently comparing apples and oranges IMO...a $350, 50Wpc integrated amp(HK) and a $800, 130WpcX7 HT receiver...me, I'd go for the HK...IF I didn't need a tuner section...
You touched on it in your post...something as complex, with what seems to have all the bells and whistles for HT as the Yamaha has , has to make some trade-offs...it's basically the same rationale for those of us who prefer separates...separate chassis, with separate power supplies, discrete components as opposed to a mass of ICs...in this instance on a lesser scale.
Question: What do you want to do...now and ultimately? What do you intend to connect as sources? How big is your budget for extra loudspeakers, etc. for a HT venture?
I recently did some checking around for reasonably priced, stereo-only gear with inputs/outputs and switching functions I require and was quite disappointed in what I discovered...again, I blame it on the mass-market, near hysteria for HT...lousy movies, mechanical dinosaurs and bigger and better explosions!!! But I digress...
Marantz has a model 4320 receiver with 80Wpc, a phono input, pre-out/power-in but no true "tape mon" function...around $400 as I recall...
If the integrated route is where you want to go, they also have their PM7200 which puts out 95Wpc OR 25Wpc of class A power...also has pretty much all the connectivity one can ask for(if that matters) around $500 I think...only recently made available in the US, it's been around a while in Europe and has gotten some good press...
Then there is Onkyo with two receivers the 8211, 50Wpc and the
8511@100Wpc...both less than $300-400...in that range....both have phono-ins, but no pre-out/pwr-in...possible a "tape mon" on the 8511...I'm gettin' older and my memory is ...huh! what!...I'd buy the 8511 myself if I didn't need the "pre/pow" connectors...as an aside, my current low-priced tweeky-toy is their MC35TECH mini-system with their WRAT scheme, rated @20Wpc into 4Ohms...I'm impressed.
Anywho...there's my input...it's strictly opinion based on my parameters, yours may differ...and there may be others who will poo-poo and pish-tosh my choices...to them I say la-de-dah!
jimHJJ(...good luck and good listening...)
P.S. Forgot to mention the Denon DRA-685,
100Wpc@$499...another good choice for 2ch music IMO...
P.P.S. And now of course, after a more robust search of the net, I find you meant the HK AVR630 not just 630...which makes a bit more sense in the comparison...a toss-up IMO for HT...the rest of my post stands as is...