Grace, whilst some of the more expensive sets do have better quality and longer lasting nibs, I used to find that it was the paper I was using that determined how long and how well a pen lasted. eg cartridge soaks up the ink. I studied graphics and we had a full set of 50 chisel-pointed markers (sorry can't remember the brand) and I found that I rarely used even half of them. Maybe buy a few mid-range pens in the colours you are most likely to use - red, blue etc - and supplement with the cheaper ones?
Like LeAnn I do fine pen work now and my favourite are Staedtlar and I like the coloured pens too. You definitely get more value paying more AND using a smooth surface paper.
Hope this helps.
I use micron too 05
I'm a Sharpie nut for black only. I don't do much coloring with markers, but I have tried every pen out there and I still go back to my black sharpies or old fashion ink in a bottle.