Do not know if I should upgrade Speakers HELP

I am new to choosing. I play rock n roll. Mainly Beatles Stones Pink Floyd + others. I have 2 pairs of JBL N28 the discontinued model 1. But they are great for $150 each pair and also 150 watts peak ort total power .I am not upgrading becasue of discontinuation . I am satisfied with them. since I do not crank them up every day. I feel scared like they are going to break when cranked at it sounds snarling when put on High I have 100 watts per channel 5.1 cahnnel receiver . I am not going to replace surround but the JBls for the fronts I feel the need for sonething I can crank up about 200watts no problem. I am really thinking of the Wharfedale Sapphire 89's. That are 350 = shipping for a pair. WIll these show a drastic change in the clearity and loudness of the sound for my JBLS bookshelves and most of all woth it. Not a rich man. Or will I probaly just be a mildily diffrence or the same. ALso I have am thinking of Infinity IL 30 or WHarfModos. But leaning towards towards Sapphire 89. If it matters I have a pioneer sho53ck 125 somethin watts center channel. 15 by 15 room
thank you Justin