"Warmth" is usually indicative of a boost in the midrange. To ask for a "warmer high end" doesn't make much sense, but I think I know what you mean because you describe it well in your first sentence. You might want to indicate what amp you are using as it could be part of the problem (or all of it for that matter). The amp>speaker interface is pretty important. Also, which Paradigms are you using? Integrating a single sub, no matter how good the sub, is often a tricky thing to accomplish well, and could also be part of the problem. The short answer is I wouldn't jump to the conclusion that the speakers are the problem.
Simple answers to a sub-$500 monitor suggestion can be found searching the archives, but I would look further into what the problem is before throwing money in that direction.
Simple answers to a sub-$500 monitor suggestion can be found searching the archives, but I would look further into what the problem is before throwing money in that direction.