I did some research on Pioneer Elite as well and you have made a good choice to keep what you have. I think their gear is neutral sounding and a very good value for the money. You will have to spend more to step up. I like my Pioneer Elite integrated amp enough to stay with the brand for any upcoming HT system in the far future.
I tried Kimber Kabling I use with my tube system on the 2 channel Pioneer Elite system and it made a very noticeable improvement in a clearer sound, tighter more articulate bass with cleaner highs. I likewise tried some Monster Cable I had laying around and it did not compliment Pioneer Elite so well, but I will bet that is what most stores offering the Pioneer Elite brand carry. This may be a good option for an upgrade that you can keep with you for the future.
I tried Kimber Kabling I use with my tube system on the 2 channel Pioneer Elite system and it made a very noticeable improvement in a clearer sound, tighter more articulate bass with cleaner highs. I likewise tried some Monster Cable I had laying around and it did not compliment Pioneer Elite so well, but I will bet that is what most stores offering the Pioneer Elite brand carry. This may be a good option for an upgrade that you can keep with you for the future.