well im not gonna slam you like toyotaguy, but it does sound as if you havent alot of experience.
i like my millermatic 210, a 251 is same but is more computerized. havent had any problems with mine.
if you need spring hangers, u bolt plates, link mounts, truss, and hd diff covers, i can email you pics of what i carry. my prices will be less than most any other thing you can find.
if you need help building it, i would be happy to help. afterall that is what this club is for. slamming doesnt help anyone. i would recommend a strong background in welding if you arent proficient. there are classes at vocational schools that are cheap that will help in that area.
anything you want to do is on the net. so searching will help you out alot. fab work isnt hard, just the welding and knowing how things work.
i bought my miller from kirks welding in sprngfld and they gave me a really good deal, about 300 less than anyone else. it also helped that i was dropping $3k there for other things also.
if your building a rig and you dont have alot of skills, stick with leaf springs. and dont be afraid to ask questions. this isnt pirate4x4 so the slamming shouldnt happen or happen again. ask your questions as only the dumb ones are the ones not asked.
if you need help, just pm me and ill answer when i log on. all in all i would pay someone to build one if i were in your shoes.
geoff