adjustable dc power question

Want to dump my sport wall warts and get adjustable power. I need to do this in a cost effective manner.
There is a power supply on the net that looks good at about $60, but it is only 3 amps. While thats more than my 2sport analog supplies put out, is it enough feeding both lanes without the hazards associated with
1of the cars offing affecting the other car? I run scaley, carrera, ninco and revOgram. All stock
Parma 35 ohm controls and sport track average lap 38 feet.
Thanks
There is a power supply on the net that looks good at about $60, but it is only 3 amps. While thats more than my 2sport analog supplies put out, is it enough feeding both lanes without the hazards associated with
1of the cars offing affecting the other car? I run scaley, carrera, ninco and revOgram. All stock
Parma 35 ohm controls and sport track average lap 38 feet.
Thanks