You also don't need a 'high current' amp- what you need is an amp that can make enough power so that you don't clip the amp.
Let's say that you sorted out that 200 watts is enough power. The speaker is 4 ohms, so if we do the math (using the Power formula) we see that
200watts = 4ohms x current (squared)
Solving for current we get slightly over 7 amps. That's nowhere near the 'high current' category. In fact many tube amps can do that.
You can't have current without voltage, and the two multiplied together is the wattage that is being made. IOW if its 200 watts that is doing the job, the current will be the same regardless of what amp is making it.
more:
http://www.atma-sphere.com/Resources/Common_Amplifier_Myths.php