Hi Joycelyn,
Agree with PersianCat... the natural beauty of MAldives already a reason to visit, esp during HM.
The only thing matters is do you need the luxury(for extra money).
Sad to say is that if you want a quiet resort, you'll need to stay in those slightly more ex resort, and furthermore your date is consider peak, so even the resort with less room will be likely fully booked, thus more "crowded" even on a quiet resort.
Peak period brings another issue... overbooking issue in some resort. So u must double and triple confirm booking with agent and resort itself.
Adaaran prestige ocean villa resort consist abt 40 rooms, probably suit your requirement, while Rannahli got 130 rooms. Rannahli seems to be a lower range resort of the Adaaran, and they do have a beach rooms while the other ones are all ocean villas.
The prestige ocean villa seems to be a better choice.
Another rather affordable resort situated at the north Male atoll, The Haven(previously paradise island) consist of 62 rooms, all are water villas. The rates looks pretty good too for a 5 nites stay within your budget.
http://www.villahotels.com/Resorts/Paradise-Island-Resort-Spa/Accommodations
As for the flight, it really depends...if you wanna to stay longer on an resort, I would choose nite flight. Stay 1 nite in Male, ask for the earliest speedboat ride and early check in(providing they allow). I would also ask for late check out since flight is at nite 10pm.
If you do not want to tired out, take the morning flight. The thing I dun like to the departure.. far to early.