I have an Arair RX-7 Corse-Air for warm weather and a Shoei X-11 for cooler/inclement weather. Both are Rep helmets...
But there's no reason not to buy the best level of helmet you can afford, but get a solid colour. If you want you can always get a custom spray job later when you can afford it... or heaven forbid... leave it plain.
I understand from a couple of articles that KBC builds a good quality helmet for a very reasonable price.

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The most important thing is to buy one that fits you shape of head... that means you gotta try them on first.
Cheers