Have you checked out B&H Photo
http://www.bhphotovideo.com/bh2.sph..._Aproduct_html___CatID=3950___SID=F4387D49F50
You can get a good explanation of each model.
You are really only talking about two different tripods, the 3001 and 3011 so far as load carrying capacity is concerned. Most of the differences (3011N, 3011BN, 3011Bpro) have to do with special features such as variable leg angles, color and other things. It would pay you to study this site and determine for yourself what you need.
I got a Bogen 3221 WN or 055BWB from them. Very happy with it. Similar legs to the 3011, except that you can independently change the angles of the legs and I think they lock differently.
Both have similar weight rating and I think any of the 3011 will be more then adequate.
I have the 3029 3-Way Pan/Tilt Head - Supports 13.20 lb (5.99 kg). Its the same as the 3030 but no quick release. I got tired of dealing with them on other cheaper tripods. Besides with a NIkon 4500, to change the battery, you have to remove the camera from the tripod, then remove the "quick release" from the camera. I was also concerned about mounting a heavy scope on a quick release.
Its a standard heavy duty 3-way pan/tilt.
I only wish I had considered the 3275 (410) Compact Geared Head (Quick Release) - Supports 11.00 lb (4.99 kg) .
It would have been real handy. It also costs $170.00
http://www.bhphotovideo.com/bh2.sph...=F4387D49F50___call=specs#goto_specifications
3001BN Tripod Legs (Black) - Supports 11.00 lb (4.99 kg) would I think, work well with the
3130 Micro Fluid Head (Quick Release) - Supports 8.8 lbs
Ideal for a VCR camera up to 8 3/4 lbs. Includes an adjustable handle that can be positioned on either left or right.
I have never used a fluid head but many others have. As far as I can tell. it allows you to pan left or right more smoothly then a standard head.
http://www.bhphotovideo.com/bh2.sph...SID=F4387D49F50___call=features#goto_features