Newbie - equipment help

Greetings all , 
I am looking for some advice , I am going to invest in a CB set up , I don't have alot of money to spend . I am undecided over a hand held or a small car unit . Radios I am looking at ,T-600 , T-800 , president Barry & Bill , and would definitely welcome help and advice on what unit to go for. My car is. Jag XF sports brake so probably got an aluminium roof, but being resourceful there are ways round all problems 
Thank you in advance

Get a small mobile radio rather than a handheld. In modern cars there's not a lot of room for mounting radios. The CRT Mike has everything in the microphone, the display, the speaker, the controls, and the main body of the radio can be put somewhere else. 

With an aluminium roof obviously magmounts are out, although they should only really be used as a temporary installation - you can still damage the paintwork with them, so a lip mount is where I'd go next but again with modern cars it's going to be hard to find somewhere to mount one. Ideally you'd be wanting the largest antenna you could put on as the antenna, as well as how it's installed, makes or breaks how well an installation works much more than the radio. Glass mounts are the last resort as they work quite poorly with a range of a couple of miles at best but they don't work well with passified glass, that is glass that contains metallic particles for UV protection.

With modern cars they've been made ever harder to install radios in and avoid drilling holes. The only real option for pretty much most stuff made over the last few years due to ever tighter panel gaps, so even if you can use a magmount you'd crush the coax, and more curves in things like boot lids and hatchbacks making using lip mounts harder to impossible is a hole drilled in the roof which is the best way anyway.

If you were to get your amateur radio licence then the options are much better as VHF and UHF antennas only need to be a sixth of the size of a decent performing CB antenna to work well so you can use some very small lip mounts which are far easier to place.

Thank you " northern crusader " a very informative and lengthy reply. Fully agree , I had previously been looking at going thru the license procedure ( I'm a bit anti system / regulatory etc etc lol and worried I may fail ) I had thought about industrial strentght velcro for mounting the unit , also I do have a rather accomodating box with cig lighter point , and as we know " height is might " so the longer the better , not sure on a permanent mount , alot to think about , thanks again

I don't normally post links, but if you want an idea of how the CBs you are interested in perform, are set up from the factory (some are very poor) and then hear how they perform over the air later in another video, go have a look for the radio that interests you on https://www.youtube.com/channel/UC6w677p4ucVOw2VxqZk-UlA/videos
Richard sets them up and tests them on air in a later video.

Thank you to all for the replies