Big bores are great for added HP but it all comes down to how deep your pockets are. That isn't something that you want to skimp on in order to keep it reliable.
Your current cylinder looks toast so either replace it, have it recoated or bump up to a BB. It just depends on how/where you ride and what power gains you are looking for.
IMO, the order of quality for a BB goes JSR being the best, Athena 2nd and cylinder works a close 3rd.
A 98mm Standard deck JSR is 780.00. I think Athena and CW are closer to 500 and under.
A good piston, CP is the common choice for quality is going to run anywhere from 200ish to 260 depending on bore size and compression.