opinion on Omega Super 3i speakers

Hi All, I recently got a 300B SET tube amp and the seller recommended that I try tip toeing into the world of high sensitivity speakers with Omegas.  I see online the Omega Super 3i series seems relative easy on the wallet to get into, wondering if anyone has experience with these?  Is 3" cone too small?   Should I save up for the bigger 7" or 8" cone size ones?  I'm used to B&W's bookshelf with 6.5" woofer.  Thanks ahead.