New Build

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I was thinking of building a bike of my own. I've looked over a few websites for parts but I'm still trying to figure out which components to get. I don't want to go all out since I only go out here and there (I mainly a road rider). I found a cheap motobecane frame on e-bay. I am only looking for front suspension, but I would like disk brakes, but don't need hydraulic brakes. I think I have deceided I wanted to try and go with SRAM components to see how they hold up, but not sure of which level to go with. I think the x-7, but wanted to see what you all thought since I don't need top of the line, but I don't want the cheapest ones either. Any ideas on this or any other pointers? I'm not sure if I Want to build the wheels yet or not...depends on how over budget everything else goes...haha
Thanks a lot for any pointers or info!

for disk brake look at Avid bb5. they are machanical and good for the money. Manitou or Rock Shox are good forks.nothing too fancy. i have the x-7 on by bike. i havent had any problems and been riding for two years w/ x-7.

So I didn't build a new one--couldn't get the money. So I tore down my old one, cleaned it, replaced parts and now I'm attempting to reassemble. One problem...When I put the rear wheel on, the spacing seems to be exactly one cog off when shifting. I flipped the axle (the threads were messed up on the once side and I couldn't tighten the cone properly) and it seemed to go together properly. Did I do something wrong? I simply flipped the cone nut, spacer and lock nut to the other side. I thought the spacer is what matters, if I don't change it, I thought I should be good...yes/no?
Also, The wheel looks like it is centered in the brakes, but not between the seat stays. Is this normal for a mountain bike? My other 2 road bikes, everything is centered. I know if sounds dumb and makes me look pathetic...maybe I'm thinking about it too much and getting frusrated?
Any help/advice would be apprciated. Thanks