Personally I'd just ride the bike as it is until you really need to change anything.
Only reasons I can think of changing anything is for greater reliability/durability, comfort or speed through reduced bike weight.
If the latter and you wish to improve your speed/endurance whatever I'd ride what you have until your performance gains look like they are plateauing - then have a think about options.
As for wheels, there's post after post on here re: better wheels. But before you buy maybe borrow some to see if you can notice any differences. Apparently my 32H Giant S-R2 wheels are 'not good' but they move in a circle which is good and apart from that have stayed dead true in 8 months of bashing my CX over pot-holed lanes, green roads, bridleways and fire trails, all with no spoke breakages. I had some RS30's on loan to try and they looked less than substantial to me (although they did look nice) and I didn't fancy them at all for rougher routes plus they make the most irritating 'whooshing' noise when on the move. My Giant wheels are virtually silent. Apart from the noise issue I noticed precisely zero difference in acceleration and rolling resistance. They felt exactly the same to me. However, maybe I am just insensitive!