personally, I think 99str @ 35 would show some serious dedication, range and mage just show some wealth. so I'd be more impressed with the 35cb option, BUT if you went the range/mage option you could still do slayer if you wanted which you may find more enjoyable?
Neither option would lack impressiveness, 50cb with high slayer would also look bad ass!
out of curiosity, how would you do the str, barbarian fishing..?