As the thread title clearly says, this discussion is going to be on the type of accessories people prefer for their car. Broadly, I have divided them into 4 categories -
1. Expensive + Complicated
Those which are expensive aand involve a lot of wiring, parts, etc. and pose a risk to warranty as well. Eg - Engine swaps, turbocharging, high-end audio installs and so on. These may result in huge problems in case the install goes wrong and requires high level of professionalism and in-depth knowledge. These can not be done as a DIY. Benefit is that it will pay you back and be as reliable and perfect as stock if it goes well.
2. Inexpensive + Complicated
Those which are not that expensive/out of reach for common people but involve complicated wiring, lot of parts, etc.. Very often, parts need to be sourced at one point and a DIY needs to be performed to keep the costs in check. Eg - DIY install of HID projectors, creating custom circuits for lighting and so on. These accessories require a basic amount of knowledge but can fry up your electricals if done otherwise. Risk of losing warranty coverage is higher.
3. Expensive + Simple
Those which are expensive but act as a one time investment because of their simple straight forward nature. Eg - Upgrading wheels and tyres, changing to a high end OEM
multimedia unit, remapping to an already tested map and so on. Benefit is that they can outlast the vehicle without causing any serious implications as the functioning/installation is straight forward or plug-n-play in some cases. Reliability can be maintained with the correct choice of products.
4. Inexpensive + Simple
Those which are inexpensive and do not included major complications during install/use. Eg - Magnetic curtains, floor mats, and so on. Most of them can be done as a simple DIY and are reversible as well. Benefit is that one can frequently repeat the use-change cycles because of the inexpensive nature of the products. Though these are not reliable as stock, these won't threaten your warranty coverage either.
If given an option to choose from one, and practically live with it on your car on a regular basis, what will your choice be?
PS. I have opted for the fourth option by the way. I prefer the reliability over anything else and believe in maintaining the car in stock condition than sprucing it up to make it stand out.