A lot of us have changed pickups. It's a fairly easy job and can make a huge difference. Personally I prefer Seymour Duncan traditional pickups like the SPB-1 over Fender but everyone is different.
A pickup replacement won't massively change your resale value on the bass but it will wake up your tone. You should do your homework and make sure you are getting what you want. The 62RI pickup will give you a fairly traditional tone but there are some hotter pups out there if you want a bit more meat (not for me but these are the most common sellers). EBay often has deals on second hand pickups if that sways the arguement at home? The resale value of second hand pickups favours the buyer.
Without hearing your bass the other things that can improve performance are decent strings, a better bridge and a good set up. Your bass may benefit from none, some or all of these things depending on how it plays at the moment.