[thelist] superscript woes

[aardvark]

ok, got a ® symbol that i want to be superscript, but that i don't 
want to have push my line-height/leading all out of whack... in IE 
this isn't a problem (obviously), but in NN it is...

code:

sup			{	font-size : 70% ;
				vertical-align : super ;
				line-height : 0% ; }

<sup>&reg;</sup>

this works well in IE, but still pushed my text all over in NN... so 
i'm debating this:

.sup			{	font-size : 70% ;
				vertical-align : super ;
				line-height : 0% ; }

<span class="sup">&reg;</span>

now, i *hate* using <span>, but advantage is that in NN, it doesn't 
superscript it, thereby keeping my line-height intact, while IE does 
what i want...

any opinions?  experience?  help in allowing me to do the horrible 
<span> deed?