Re leads
You wont really notice an improvement in power unless your old leads were totally screwed...

Trust me the extra thickness of the Topgun is going to do SFA on a N/A and on a moderately tuned turbo. the only time the difference will be noticed is when the leads are totally buggered, or are reaaly really old.. or your running high power/boost.
when i bought my leads (non genuine from twosrus) there werent any genuine toyota ones available for a cheap price
now twosrus stock them along with genuine cap and rotor and the price is very very good for what your getting compared to buying locally.
the tune up kit made a big difference to my car and fixed my misfiring under high load/boost.
so in my case im not sure wethere the cap, rotor or leads were faulty but i did a general maintenance and changed them all at once and the improvement was quite noticable. so noticable that i started hitting fuel cut lol
 
btw the aftermarket leads i have and others i have seen dont fit well in the lead holder thats on the engine bay. cause they are thicker and dont press into the holders properly. not a big deal but just thought id mention yet.
 
cheers

have a look here mate
 
http://twosrus.com/catalog/index.php?cPath=22_101
 
they are in the states so you need to add shipping
theres usually some sort of group buy happening few times a year by someone or the other here so just get on one of them when it happens and buy the lot in one go
 
cheers

I just bought a rotor and cap from amazon. Cost around $60 delivered. Also got the leads there too for around $50. With your plugs being a turbo it depends on the power and boost your running. You may need to go to a colder plug. I wouldn't recommend copper plugs in a heavily modded turbo car, you will need to get a very cold rating to stop detonating. With NA's you don't need to worry.

Tree

I got new rotors and dizzy from Two's R Us ages ago. $80 total. Shipping was roughly half so about $40. My first time and last time lol. You could prob get a better price from Road and Track or even the dealer, just give em a ring. Group buys are awesome but only when they happen

yep it's only worthwhile if you buy a whole bunch of stuff from the states or GB...otherwise you usually get smashed on the shipping.
I've found Amayama trading pretty reasonable for my bits and pieces.

Toys r us only have 5sfe parts for the Na
Would I be fine to buy turbo stuff? Or will it not fit?

If you still want to buy from Two's R Us, get the 2nd gen 3SGTE dizzy and rotor. That will fit your 2nd Gen 3SGE