Although the bulb idea is not without benefits.
There is an assumption made about Xenons which lead people to suggest a bulb replacement as an alternative.
The presumption is that Xenon lights are only brighter than 'normal lights' - therefore it's simply a case of fitting brighter bulbs and hey presto.
The flaw is that whilst Xenons are brighter their main benefit in the T5 is a much wider scope of light - which makes a world of difference on country roads and the other difference is the LED DRLs which for crappy weather and early morning starts work really well.
The point is - it's not just the bulbs, it's the lights themselves - they give a very different sort of light, both in the light they give out the way it is distributed. i wouldn't not recommend a bulb replacement, seems like a good and sensible idea but as a cheaper alternative to Xenons, not so convinced.
The same argument can be applied to any piece of kit, gadget, alloy wheels, camping gear... That is, there is often a cheaper way of doing things, but there is also personal choice.
i like the side lights idea though and I guess you could upgrade your front lights and pay for those LED DRLs on the bumper