1/8 Kyosho set I don't think the RTR set is avaliable in HK anymore. You need to build the bike and get radio for it. The venom is RTF with radio, the silverlit is RTF as well.
For 1/5 Thunder tiger both nitro and electric are RTR. NF are kits and you need to build the bike and get the radio seperately.
For the kyosho the stock setup is very very easy to drive but not fast. There are a lot of DIY necessary to make the bike go fast. If you like to start get a bike and bring to one of our bike meeting and a lot of ching there will help you.
BTW: I think you should start with the kyosho bike as the stock setup is easiest to drive with the "heavy" front wheel. Very stable. And you can use other radio for it if you do not use the futaba ESC/ receiver set. I am using Spektrum with hobbywing brushless in my kyosho now.
