Dehumidifier - To buy or not to buy?

Ever since we shifted in to Park Central, we have been in this dilemma of whether to get a dehumidifier or not. As the master bedroom toilet and the wardrobe share a common wall, the humidity level in the wardrobe is rather high =< I really hate the musty smell that our clothing tends to get after a while. 

The same goes for other areas in the unit, like the storeroom etc. Have heard various theories that humidity in Ang Mo Kio is rather high as we are near to various water catchment areas like Lower Pierce Reservoir etc.   

Source: gothere.sg

However, I suspect it has more to do with the layout of the unit. There are so many openings to the unit. The amount of dust that accumulate in the unit per day is amazing especially with my 'open door' policy. I love having fresh air and lots of sunlight in my living environment.

Unit layout

Have previously tried dehumidifiers from Daiso which filled up in less than a month (capacity was around 300 ml at S$1 each - 2 pcs in a pack). 

Dehumidifier from Daiso

Currently using Fairprice Water Jumbo Dehumidifier (600 ml capacity at around S$1.50 each). Similarly, the container is around 25% filled in around 2 weeks.

Fairprice Water Jumbo Dehumidifier

The operating costs of dehumidifying the master bedroom and other areas in the unit is getting rather high. We went to various electronic stores to take a look at the dehumidifier models available in the market and were quite shocked at the prices (cheapest model was Novita ND290I at S$469). Decided to take my search online and happened to come across these 4 dehumidifiers listed on Qoo10:

Source: Qoo10.sg

Option 1. ETD-250
- Smallest sized model out of the 4
- Suitable for 10 sq m space
- 1 button to operate
- Most likely made in China
- Size: 21.8 cm (height) x 14.6 cm (width) x 13 cm (depth)
- Capacity: 500 ml
- Price: $79.90 + $9 (shipping)

2. Dehumidifier + Fan
- Like the dual function option 
- Made in Korea
- Size: 41.3 cm (height) x 28.8 cm (width) x 21.6 cm (depth)
- Capacity: Not listed (but should not be more than 500 ml) 
- Price: $120.00 + $23 (shipping - too expensive)

3. Morning Up MU-898 Mini Dehumidifier
- Made in China
- Size: 22.3 cm (height) x 14.6 cm (width) x 13.5 cm (depth)
- Capacity: 600 ml
- Price: $79.00 (free shipping)

4. Olee Petite EF 881
- Most pocket friendly and functional option
- Suitable for 20 sq m space.
- Made in China
- Size: 30.9 cm (height) x 19.4 cm (width) x 13.5 cm (depth)
- Price: $109.00 + $5 (shipping)

Did not manage to find much user reviews though. Do let me know if you have any recommendations =>