Past 61 is easy to tell about. Because unfortunately there's not a lot you CAN do that won't be an utter waste of your time/money. And the stuff you are doing is still gonna put a serious dent in your pocketbook, just not as bad.
Venom dust>venom potions>venom boltheads Do not be tempted to sell ANY of the dust/potions. You WILL need it for the bolts (which require a small amount of smithing skill, 12 I believe).
In between potions and bolts you can do holy mauls if you find plenty mauls for sale. These sell for a minimal loss, but they are quick and easy and can be sold to a vendor.
Ouka ranman, when I did it, worked out great to 84, however this was before they changed the yield on it. So I dunno how good it is now, but worth looking in to, This requires a small amount of woodworking skill (30s I think). If you don't have the WW skill, you can do bloody boltheads to 81 (also smithing ~12) which are painful, but they do sell.
Repair comp rods to 85 if you enjoy fishing. It's not fast, it's not cheap. But hey...it'll get the skills. This caps at 85.
And then, there's no real way around it. The "hell" stage...creating comp rods. Ohhhhhh I hated that step! I actually blew up large chunks of money making cannon shells (cap at 94) just to avoid making comp rods which sell so slowly it made me sick.
After that, it's really a matter of picking which item has the most ingredients for sale and won't make you cry LOL.