Portable dishwashers is becoming more and more practical for students or for people who are renting but before, built in dishwashers were more frequent.http://www.perfectdishwashers.com/ has professional dishwasher reviews out there on the market. Here, you would be guided on how to choose the best dishwashers in the online market, specifically in Amazon.com.
Model: BIDW18BL-1
Type: Built in dishwasher
Size: Approximately 18 inches
Price in Amazon.com: $369.00 with free shipping.
Design: Stainless steel interior
This model has Six (6) wash cycles: Rinse, light, normal, heavy, glass and speed. It is very efficient in cleaning and it also has a coarse filter. It has two indicators for rinse aid and washing phase. It has a dial cycle wash selector and two buttons for on/off and pause/start. It also has two pull out dish racks, a silverware basket and a cup tray for easy storage. It have a user friendly interface, it comes with a rinse aid indicator and phase indicator lights when washing portable dishwasher . It makes beeping sounds once the cycle is over. The model comes with a one year warranty. Ratings of individuals who purchased this product are 5 out of 5. 
Model: DWE1813B
Type: Built in dishwasher
Size: Approximately 18 inches
Price in Amazon.com: $491.40 + $5.50 shipping
Design: Stainless steel interior. It also has an upper and lower rack with handle that is coated with nylon.
It has 4 automatic Cycles. It gives efficient cleaning and has a 3- Stage Filtering System. It has a silverware basket. It comes with a one-year warranty. It has a rinse aid dispenser. The ratings of individuals are 5 out of 5. It has a user friendly interface. It also has a power indicator light.
Brand: SPT
Model: SD-9252W
Type: Built in dishwasher
Size: Approximately 18 inches
Price in Amazon.com: $352.59 with free shipping.
Design: Stainless steel interior
It has six wash programs: Speed, rinse, light, normal, heavy and all in one. It has two spray arms for a thorough cleaning coverage. It has a time delay feature between hours to 24 hours. It also has a silverware basket for utensil storage. It has a one-year limited warranty on parts and labor. It doesn’t have dispenser options. The ratings of individuals who purchased this product are 4.5 out of 5. It has an easy operating and control settings. It is user friendly. It comes with a rinse aid indicator and an error alarm system.