For the past 6 years ive mixed used just a stereo systems speakers :( Though with DECENT results ...

I ust bought a par of KRK ST6's... I really need to buy an amp. Unfortunatly, i want to stay below $300..
I know there cheap speakers...Is it worth spending a ton on a amp?

Here are the specs:

Drivers: HF 1" Silk Dome Tweeter, LF 6.5" DLDA Aluminum Woofer
Frequency Response: 62Hz-20kHz ±2dB
Sensitivity 1W @ 1m: 89dB
Maximum SPL @ 1m: 107dB
Nominal Impedance: 8 Ohms
Maximum Power Handling: 100 Watts
Dimensions: 13"H x 8-3/4"W x 9-3/4"D (33 cm H x 22 cm W x 24.5 cm D)
Shipping Weight: 21 lbs. (10 Kg)

Any suggestions?