The one handed shuffle is a real treat for your audience - and something that they will never ever in the reign of pig's pud expect that they will be able to do it. That's the essence of flourishes, I think, it's to learn them so well that you do them so quickly and fluently, that the audience wonders where you stashed your extra digits.
Some people have great difficulty with this move, and personally, the 'revelation' which made this whole move fit into place was getting the start grip and angle of the hand correct.
It is essential that after the first cut - to get the pack into two piles, that your fingers are 'in position'. Also, it pays to practice the cut itself quite heavily, as getting two pretty even piles is essential. Then, it's a matter of getting the correct balance of grip and pressure - i.e. a weak grip = cards all over the floor, and yet, too much grip pressure = cards not interleaving properly.
This move is all about delicacy, and I think you'd be better learning each little stage one at a time, as the whole thing relies on a fluid action - you can't do this one slowly... or so I've found.
As for other flourishes, personal favourites which I use all the time are:
1. Illogical cut
2. Riffle shuffle
3. Swivel cut - blind
4. Le Paul spread (not so much a flourish, but a gorgeous 'spread' move
5. 'sloppy' table riffle... as opposed to a perfect weave, loosely drop lumps of cards. Looks nice.
6. Blind cuts
7. Running Hindu shuffles
8. Card springing
Most of the above actually condition the audience into seeing you do odd things with the cards - which is great at making your actual sleights look natural. Also, some are utility moves as well - such as a a blind swivel cut - it not only looks good, but keeps the deck in perfect order. As does a simple blind cut to the table. And believe it or not, the complex 4-cut 'illogical' cut does the same - they are blind cuts - i.e. they retain the order of the deck.
Card springing can be used to bridge the deck, or part of it, to aid in location of a particular card. And of course, a reverse spring will 'straighten' the deck again, to alleviate suspicion.
In fact, there are loads of flourishes which are also useable as utilities - i.e. they don't just look good, they serve a purpose.
And, it's also nice to have a few simple flourishes tucked away for best, for such things as Triumph routines - where you make a REAL effort to look flamboyant when locating a card!
There are loads of resources for learning flourishes... and if you then prefer to go the route of 'flourishes and manipulations' as a whole show, you should check out Jeff McBride - this guy turns card flourishes into a magic-less, solo performance. Awesome stuff!