I do want a bigger sound.
The JBL 4349's will give you a larger and very dynamic sound and your Accuphase amp has all the power they need. 😎
I recently set up another system in a similar size room (10x14). I use the QLN Prestige One. They are easy to drive and your Accuphase and other gear will be a great match. As a matter of fact the dealer who sold them to me recommended Accuphase electronics. They do very well with large scale orchestral. I listen to classical with my morning coffee almost every day. They are also within your budget. Part Time Audiophile has some online reviews you could check out. Based on what you describe you’re looking for I think they’re right up your alley.