Would i need to upgrade my alternator?

ive got a 140 amp powermaster alternator that i purchased a couple years ago, well ive got a Alpine MRP-M500 amp or a 500 watt amp, 2 12" alpine subs, a 4 channal eclipse amp that puts out about 75 watts per channal which is about 300 watts rms and the total amp draw is about 60 amps and 45-50ish amps for the alpine amp, well im thinking of getting 2 12" Alpine type R subs and a Alpine MRP-M1000 amp that puts out about 1,000 watts RMS and i was wondering if i should upgrade to maybe a 200 amp alternator...i got the money and ive been thinking of doing it anyway couse the alternator i got was kinda a cheapie since i payed only about $200ish for it.