I understand what you are trying to do. That said, you might mess up the way you are going about it here. First is with the pricing. Quite often, price plays absolutely no part with regards to sound quality. You might love something that cost a small fraction of what you were willing to pay or buy something really expensive that you will end up hating. You can look no further than my own system. I have somewhere around $25-30k in electronics for a pair of $2000 speakers. I made my choice based on results, not price.
Second, I feel its a big mistake to buy components to compensate for others. (Understand, though, very few people on this website would agree with me on this). If you bought an amp and speakers that come up short for you in some areas, I would recommend that you deal with that first before you move forward with other purchases. Let's say you decide keep the components, instead, and get some tube components and cables to balance the system out. It sounds like a very reasonable thing to do, but, in practice, is very difficult. Doing that is like buying an EQ with 1 setting. The worst part is that yo have no idea what that setting is until you buy the item, hook it up, and then cross your fingers when you listen and hope you guessed right. That's not all, either. Lets now say you get lucky and guess right and the system sounds pretty good (not at all likely, but maybe). Change 1 piece, and its likely that the whole system will fall apart because instead of buying neutral, you bought to compensate.
So, I still stand with my original recommendation. Listen to your amp and speakers and just take some time to see what you like or dislike about them before you jump into something new. If you don't have a DAC and you need to get something, I feel your safest bet is the card for you B100. If you end up selling it for some reason, it will go very quickly on Audiogon and for a good price.
