As far as quality of components go you really need to buy the best you can afford,
To be honest if you can only afford the cheep crap then wait or break out the credit card.
AAC do a UK friendly postage from Canada works out cheaper than buying in the UK.
As far as performance if you buy a basic system you will kick yourself as you will want faster/more moves.
Best get it all first you can always buy slow downs for a tenner or so.
Bags,
Slam/Universal Air/Firestone/Airlift Dominator.
Valves,
Asco's/GC extreme/SMC,
Comp's
Viair or AZ's but I have heard bad tails about Air Zenneth...
Make sure you get DOT rated tanks lines and fittings dont risk safety for the sake of a few quid..
Cheep gear risks....
