Those are two great strings. Unless you have super sensitve ears, I don't think you will go wrong either way.
I love TI strings. They are great. Their round sets mentioned above, plus I love their flat JF344s. Having said that, DR makes great round wounds, too! The Sun Beams are super, but so too are their Hi Beams and Lo Riders. The only ones I haven't tried are their Black Beauties, but I'll bet they are fantastic as well, based on the reviews.
I think this might be the least expensive string site on the net:
http://www.stringsandbeyond.com/thomastik.html <= this page has the TIs you are looking for. They also have DRs for low prices, but I don't see the Sun Beams listed. I'm sure you can get them, too! Just call the toll free number and ask a live person.