1) There are a lot of customized tank maker, Henry from Marine Life at West Coast, Iwarna at Pasir Ris fish farm, Coral Reef at Ubi, AquaMarin at Upper Paya Lebar Rd and many more that the others could chime in.
2) 1 Main pump is enough for the return pump for the tank as well as chiller. A Eheim 1260 is just nice. A work horse brand that last long.
3) You could go with either Tunze wave maker or Vortech wave maker or a mixture of both. High quality equipment and some of the wave maker from Tunze are programmable. All model of the Vortech are programmable too!
4)Top brand are Arctica and Teco follow by made in China Hailea and Resun. With proper placement and ventilation, chiller should last long unless placed in cramped and poor ventilation area. Best advise is to get 1 model up of the required chiller model you want to purchase due to the coming hot weather. A higher model should be able to cope with the extra heat load during this period. Also, another tip is to get the chiller modified to include an external temperature probe to be placed in the sump. Reason being, most of the internal temperature probe design are flawed in that if you choose a low flow rate pump, the internal temperature sensor in the water compartment of the chiller might register a lower reading and will switch off the chiller. A few minutes later it will switch on again when the cool water had exited from the chiller being replaced by the tank water. With an external temperature probe, the chiller is actually measuring the tank water, hence giving a proper reading of the total tank water.
5) For your tank size, look into the Super Reef Octopus XP 2000 cone skimmer. Low wattage of only 30w and there are 2 model to choose from for in sump operation.
6) Led light set are the in thing nowadays with their lower power consumption compared to their T5 and MH ( metal halide ) counterpart. Look at Maxspect light set, you would need their 170w model or the 230w model for your tank size, depending on what type of coral you want to keep.
Hope this helps!