Your SB and Kepler will do just fine for a very long time, don't worry about them. You can - of course - allways spend thousands on new hardware which will be 10% faster, but that doesn't mean that they "became passe".What broke me was my (2) Sandy 2500Ks and (2) GTX670s becoming passe before I opened the boxes.
Welcome to earth. This is how (we) humans run things nowadays:shadedshuHere I am spending money like crazy on electronics and he's literally eating garbage.