ok since this has become op-amp selection (which i dont mind, infact i'm looking forward to it). what i have in mind is an op-amp/amplifer that can work as voltage follower (buffer) non inverting amplifier for my hantek 3x25, work up to 100MHz, something like 12Vpp or ±6V 24Vpp, acceptable(*1) noise and distortion, that can give some reasonable(*1) power to a load. i dont have any clue, but this 741 exercise proved that building a voltage follower for that is not as easy as theory said. if any pointer, i'll thank you.
(*1) acceptable and reasonable terms are subjective matter as i'm not expert on this, you may define whats acceptable and reasonable based on quality vs price, performance, usability, availability etc.