Calipers: Big one or lightweight?

[Bogara_ZO]

Hi, I've read a lot here about brakes, but haven't found the answer yet. I know there are serious guys here, so please help me and others by collecting the pros and cons in one topic.

Using porsche brakes is a common choice (and well discussed here), but what is the best if you have other pcd? You have countless possibilities,
hard to decide which is the perfect one for your ride. (Yeah, I know that all cars are different, so let's talk about an average GL super beetle with 150 bhp in the back, maximum 17" wheels and a normal weight, basically a daily driver but owner wants having fun on trackdays a few times a year)

On one hand I want the biggest unit available, on the other hand the unsprung weight comes in mind. So what to do then?

I found these options, but haven't tried none of them yet.

1, Get big fixed (originally front) calipers from modern cars for front and rear and match them with some rotors.

+ cost effective way (Alfa, BMW, Mercedes, Japanese Brembos can be found cheap)
+ you can buy parts if need for rebuild
+ awesome braking power can be reached

- mounting could be labour intensive
- maybe too heavy (BMW alloy Brembo weights ~4kg, a Porsche < 3kg)
- hard to find out the f/r bias (they are from front engined cars)
- brake line issue
- requires at least 16" wheels, so all the classic ones are exclused
- spare wheel issue
- hand brake issue
- master cylinder issue

2, Mix the proven Porsche calipers with other or custom rotors

+ easy to get infos of the conversion as they are popular
+ mounting brakets available
+ good stopping power

- not too cheap
- hand brake issue
- 16" wheels at least
- still can be too heavy
- find the correct rotors

3, Use aftermarket calipers like Wilwood, AP Racing, Tarox etc.

+ matches your needs
+ will fit under any wheels
+ lightweight construction
+ can use standard of aftermarket beetle rotors as well

- hard to get infos (if you have don't hesitate to share!)
- $$$
- brake lines
- getting new pads can be comlicated

4, Use a complete setup from a modern car

This is my last idea came to mind recently when I drove a Lotus Elise R and was impressed by the brakes. It would be more than enough for a bug.
Both the beetle and lotus are lightweight cars, with a similar weight distribution and no servo / brake booster(?) ! The Elise has 2 pot calipers in the front and poor slindings in the back, and IIRC ~280mm rotors in all corners, ~22mm MC and handbrake! Not easy to find a Lotus brake kit for sale, but nothing is impossible However I belive - and have read here on the forum as well - on a beetle (nearly) same brakes would be the best bet, that Lotus really made me think it over...and also Chsristian Stelzer's 1303rs (www.vw1303rs.de) has something similar (AP4pot fronts and "just" 2 pots rear)..what do you think about it?
Thanks