which filstar should i buy for my 55g and 125g??

[K_S_W_I_S_S]

i have 160$ and i want to buy rena filters for my tanks, i have 2 ac 500s on my 125g and i have 2 cheap walmart filters on my 55g (they're rated for 30-60 g's). i want to ordder them from big als, do the filters from there come with anything? if so, what do they already have? would a xp1 be ok for a 55g if it had the 2 other filters also?? the water stays clean with the 2 other filters already... and would a xp2 be ok for the 125g (with the ac500's) or should i wait until i get more money to get a xp2 and xp3??

[NJ Devils Fan]

I would get 2 xP3s, so wait until you have enough money. You could just eliminate those crappy filters from the 55 also if you get the xP3.