Which RO unit

ok i am going to be purchasing an RO unit in the coming months and id like to find out which one i should buy. i have found a few options i just want to know which one would be the best option.

coralife pureflo 2(50gpd 4-stage)
http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+4395+12093&pcatid=12093

The Dual Carbon Optima Vision
http://www.purelyh2o.com/store/inde...category_id=7&option=com_virtuemart&Itemid=53

bulk reef supply 75gpd 5-stage
http://www.bulkreefsupply.com/store/75-gpd-ro-di-5-stage-standard-system.html

build your own system(if i you pick this one which selections would you choose for each stage)
http://www.bulkreefsupply.com/store/build-your-own-ro-system.html

5-stage 75gpd system from here(cant add to poll but if you pick this one just say it here)
http://www.thefilterguys.biz/ro_di_systems.htm

also any option i pick i am getting a dual TDI meter

i just looked on the website for the city of tampa water and it says they add chlorine and ammonia to the water which produces monochloramine so i might want to go with a 5 stage RO unit

thanks and i will be sure to go for a 5-stage unit when the time comes

that may be a bit large and pricey for my needs

yea but im not planning on living at home with mommy for the next 5 years lol. i also dont need a huge supply of water at most ill only have 4 salt tanks 1 24g, 46g, 5g and MAYBE a 75g now if when i get my own place i might look into a unit like that but until then ill do just fine with one of these smaller ones