Hi Jabbran,
Welcome to the wet side!
You may have to rethink your budget, because unless you find a second hand boat that comes RTR, all you can get for €163,00 is a toy.
Something that can be made into a good boat would be this:
http://cgi.ebay.nl/ws/eBayISAPI.dll?...&indexURL=
See if you can find a local shop to save on the shipping.
BUT, this is a very small hull, on the water of a decent size lake, it will be out of sight in no time (as it's quite fast for it's size) and it will run only on calm water, once it flips, it will not turn back up.
A decent size would be something like this:
http://r2hobbies.com/proddetail.php?...6011a090bc9a2a
You'll need a radio set, servo, ESC, battery pack (NiMH or Lipo) a charger with power supply to get it running, making a total of about € 300,00+
To the wishlist:
1) The larger the hull, the higher the speedpotential, how fast it goes depends on the motor and battery selected.
2) The larger the boat, the better the visability, modern radio's have more range than you can see the boat at...
3) There's no such thing as RTR, the boats are assembled at best, and usually not very good, you have to check every bolt and secure it with loctite, check for leaks and repair them, lubricate the shaft and check the overall set-up.
Best is to have an experienced boater prepare the boat for you to avoid nasty surprises such as a flipped boat sinking on it's maiden trip, because you were not told to tape the hatch shut prior to running the boat... (no, the clever rubber surround and the one touch button to close the hatch doesn't mean it's watertight, not by a longshot...)
4) see above.
5) more capacity (mAh) usually means more runtime, more runtime means more heat in all components, more heat requires a working watercooling on ESC and motor. Stock 'RTR"have 6-10 minutes runtime, depending on how you handle it.
6) Speed costs, size costs, battery capacity costs, so a commercial 'RTR'is a compromise.
7) Reliability is, next to good components, mostly a matter of maintenance and sensible handling
Regards, Jan.