You did well buying the NAD 326. IMHO, more than the power difference, the fact that the 326 has sub out and PRE/amp that can be separated justifies it over the 316.
Speakers contribute most to the character of a sound system. Many people putting together their 1st system haven't heard enough distinctly different systems to identify what character they prefer, and what qualities they most demand (soundstage vs. detail). There are a number of quality speakers selling under $500, some far less used, that you might consider purchasing to get by with as you explore the speaker marketplace. You would be positing yourself to enjoy your system now and on an inexpensive path for an upgrade once you have identified what exactly you are looking for. Just a thought.
Speakers contribute most to the character of a sound system. Many people putting together their 1st system haven't heard enough distinctly different systems to identify what character they prefer, and what qualities they most demand (soundstage vs. detail). There are a number of quality speakers selling under $500, some far less used, that you might consider purchasing to get by with as you explore the speaker marketplace. You would be positing yourself to enjoy your system now and on an inexpensive path for an upgrade once you have identified what exactly you are looking for. Just a thought.