It always is a safe bet that the weakest link is the room, followed by the recording. Spending $40 on The Master Handbook of Acoustics, and another $500 on DIY treatments, will trounce any equipment or cable upgrade. If you just have to spend more, throw in another $300-500 for an RTA to really do it right with some actual measurements if you are new and can't/won't fully trust your ears. It might also help you optimize the integration of the sub with your mains - usually another weak point in a system. Then another $500 worth of very good recordings and new artist discoveries, with a modest allocation towards your favorite adult beverage if you are so inclined.
All the above will give you many many hours of involvement, education, enjoyment, and sense of accomplishment. Consider the road less traveled. ;-)
All the above will give you many many hours of involvement, education, enjoyment, and sense of accomplishment. Consider the road less traveled. ;-)