Sony makes good tvs and blu ray players, but their receivers and HTIBs (home theater in a box) leave a lot to be desired. They tend to not hold up as well as others. I'm not real familiar with Technics HTs. They made decent stereos back in the 70s. They're made by Panasonic, and I, personally, don't like Panasonic at all, because of past experiences.
For home theater, a couple of the best systems are Denon and Onkyo. If you're not experienced with setting up systems, I'd stay away from Denon. They are very good equipment, but not easy to setup and use. Especially their remotes. Onkyo is the easiest to setup and use. They are a lot of bang for the buck. Onkyo's HTIBs are very good because they give you a real receiver, with plenty of features and inputs, which most other brands don't. If you're going to get an Onkyo HTIB, I suggest the minimum of the HT-S5300, because it includes a powered subwoofer, instead of a passive
subwoofer. So, in the future, if you decide to upgrade speakers and/or sub, it will be easier to do. A powered sub
also leaves more power for the receiver to use.
Buying a receiver and speakers/sub separate is always the best, but it runs into more money to get something good. Good speakers aren't cheap, and they are the most important part of a system, since they are the sound of the system. They can't afford to give you real good speakers in an HTIB, at the HTIB's price point. The Onkyo system gives you as good a speaker set as you'll get, in an HTIB. To get a good
speaker set for home theater, I'd expect to pay a minimum of $1000, just for the speakers. Then $400-$500 for the receiver, and $150-$300 for blu ray player. There are good blu ray players for $500 and above, but most don't want to spend that much on a player.
Good luck with whatever you decide on.