With a proper crossover setting, most any good set of speakers will get louder than you can handle without distorting audibly. On some set, the tweeter might beign to scream a bit (some higher end ones use a lightbulb in the crossover to compensate for this; as the bulb gets more power it gets brighter and hotter and its resistance increases, taking power away from the tweet). A large-ish dedicated midbass (6.5" or preferrably larger) getting the crap powered out of it will help the mids get louder by allowing you to raise the crossover freq of the mids and dump more power into them before they start to approach their mechanical limits. Another consideration is having enough power on tap to get as loud as you want and still have plenty of amp power left. If you are taxing your amp and clipping it to approach the volume you want: 1) you are either deaf or soon will be, 2) you need a bigger amp, 3) you will soon be replacing your components. You also need speakers that can handle the power you are throwing their way without breaking a sweat both with respect to voicecoil heat and physical limitations. Crossovers play a huge role in this both for the mid and the tweet. It would seem as mentioned above that you have some money to spend. Get a dedicated midbass and a set of good components and go with a 3-way system. If you can get another amp to power the midbass, even better.