One thing I'd like to see added to the 998 (which isn't on the 997 or 990) is a Balanced XLR analog CD input. That way "higher end" CD players or DACs with Balanced XLR outputs can be be used, instead of having to use their unbalanced RCA outputs. On my 990/7500 combo, I'm using 5 MIT XLR cables to connect them, and think it does sound better than using RCA. Since I'm looking to buy a higher-end CD player later this year (or next year) it will most likely have XLR and RCA outputs, so of course between the two it would be better to use the XLR.