My advice would be go for the LA 25 and the Sig SkyRay. Copy the SkyRay parts so you can build a second, or third one. I'd get the RC engine, and for learning set the throttle to give you the power you want. You'll need some 60 ft .015 lines and a reasonable control handle. When you get to the point of flying maneuvers you can get a CL venturi from Stuka Stunt, or someone else. your RC clunk tank will work just fine. If you can find an experienced person to fly with, that will be a huge help. For an English source, check out Hallam Models.

Here is a useful British site. http://www.controlline.org.uk/phpBB2/index.php