Level wind and magnetic are not options, your options are level wind and non level wind, magnetic is in relation to the braking of the reel itself, some interesting reading here on various types of braking:
http://www.japantackle.com/Topics/brake_system.htm I would recommend a non level wind, a level wind restricts casting distance greatly and leaves it difficult to undo birdsnests
Line lay is very easily picked up, as StevieR stated, I started off using a fixed spool, progressed to level wind multiplier and if I'm honest used it maybe twice, if even that, before getting a 7ht mag.
To be honest I buy most of my gear online, I try to use Irish companies most of the time but if there is a substancial difference in a price it's the cheaper one hands down wherever it may be based, do not rule out your local tackle dealer also, first hand information and assistance they can provide can be invaluable, my local tackle dealer just doesn't cater for my needs
I find Glasgow Angling Centre to be quite overpriced in general, love having a look through their clearance section though for stuff I don't need