Ena Harkness is a dark red rose with a very strong 'rose' scent. I love it but it depends on the colour you want.

Fragrant delight is a rather pretty pale peachy colour, and is very fragrant - not a large bush either. If you like yellow roses, 'Korresia' is a small rose with clear yellow flowers, very disease resistant - I wouldn't describe it as 'very' fragrant but its most certainly fragrant.

The two most fragrant roses I grow are Chartreuse De Parme and Special Anniversary. If you go to a Rose specialist like David Austin or Peter Beales, you will get plenty of info there about their best scented Roses. I like to use www.thefragrantrosecompany.co.uk and have always found them excellent. Here's another source of help...
http://www.amateurgardening.com/top-tips/roses-top-tips/top-10-roses-for-scent-7595

My favorites are 'Angel Face', 'Fragrant Cloud', and 'White Lightening', though that last is hard to find, these days.

Whisky Mac is a lovely orangey colour with a strong scent, as is Just Joey. If you want a red one then Ingrid Bergman is the girl for you. All these are hybrid tea bush roses but to be honest there are so many gloriously scented ones that you may be better off going to the library and borrowing a book to give yourself a better idea.