LED bulb and HID advice

[JudgeM]

Hi all. I'm new here, I'm glad I found a site like this. The DIY stuff is really helpful.

I have a 2008 Vios (Thats Yaris Sedan for most of you). I am considering getting some LED bulbs and HID for the head lamps but I am worried about a few things:

1. LED bulbs - For stuff like the rear tail lights and turn signal lights are they every bright enough ? Especially in the day ? Safety is most important to me and the lens on these cars were never designed for LED. There are so many types out there whats best ? I am looking at the spider LED lights for the tail.
I presume I will need load resistor for the turns too ?

2. HID. As the head light lens use H4 bulb which has both hi/lo beam in it. I will have to get those HID kits that have a solenoid that moves the bulb to control hi/lo. HID takes time to warm up, how will it work for just flashing the high beam in the day time ?

Regards.