New small-leaved hybrids being grouped together under the term "red hollies" include at least one cultivar that has been on the general market that produces a narrow crown.

Maybe not a holly in the traditional sense but
Ilex vomitoria 'Scarlet's Peak'
is very very narrow and is a female berried replacement for 'Will Flemming'. It supposedly does not fall apart with age. Hardy to zone 7. Hard to find, I got two at the SFA Plant sale.

though we enjoy your company ... you might find more experts on holly.. in the shrub or tree forums ...

though they are evergreen.. they are not conifers ...

and dont get me wrong.. we have some great gardeners here... so feel free to ask anything you want ....

its just that you might find that one true nugget of info ... somewhere else ....

ken

Thanks , i wasn't sure if this was the right place for the Holly question..Ill look for the holly thread