Rear Wheel rim cracked

I`ve had a set of Cole Rollen Elite wheels for over a year now, however the rear rim is showing signs of cracking round some of the spoke holes, with one quite bad. So in a bit of a conundrum on what to buy next, keep reading that someone my weight 90ish kg should be looking for a higher spoke count wheel but there aint alot out there unless going handbuilt. Not wanting to spend lots just now, budget limits and all that. Are there any wheelsets that can take a wee bit of punishment? Was thinking either a brand new wheelset or get just a rear now?
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90kg isn't light, but nor is it heavy in terms of typical equipment weight limits
there're a few threads on the subject, might be worth a read, for instance this has a lnk to spa cycles...
viewtopic.php?f=40042&t=13031062
Persue a warranty claim though as year is not long unless you have done 10,000 miles on them and have concave brake tracks.