My mom uses the V-Moda Vibes. Lasted her 2 years before they died from poor treatment. I used some Bose In-Ear Tri-Ports, but I would definitely not reccommend them for working out. They are too easy to pull out of your ears, and you must wear the workout accessory to counteract that. Also, if you do a lot of running or quick movement, do not go for ANY of the Shures. They sound GREAT but have an extremely heavy cord, which yanks them out while constantly moving. However, for weightlifting and stationary biking, they would be fine because you are not moving that much. I walk 2 miles to school every morning with the SE210's and they don't come out really easily, but if they get yanked enough, they will pop out. Same goes for the Bose. If the Shures work for you, I reccomend you go to an Apple Store and try them out. Spend time with them because they all sound different; the base model SE110s are very flat, the SE210s have more definition (thus the name High-Definition), and the SE310s have the High-Definition mirco drivers of the 210s as well as a bass module, so they sound extremely good.(That was the extent of my testing, because I did not have enough $$$ to buy anything higher, but your budget may be different.) However, as you go up in model, the price goes way up too. I could not justify $250 for the SE310s that sound only marginally better than the $150 SE210s.
The Bose, V-Moda, and Shure SE-110s all have an MSRP of $99, but you can find the Bose for $89 and the V-Modas for $69 (Costco). The Shure SE210s are $150 and the SE310s are $250. Don't know if this is in your price range because these are a bit higher end than the ones 4DThinker suggested.
I personally think the V-Moda's, while having the poorest sound quality (they distort the music a bit and are a bit too bass heavy in my opinion), are a good choice if your workout involves lots of movement (most aerobic excercises, running, biking, etc). If your workout is slower, go for the Shures over the Bose. So far, the Shures have been much more durable (had them for 3 months, no problems, and the Bose had to be replaced 6 times in 2 years), and sound WAY better. If you are looking between the SE110s and the Bose, however, I would take the Bose because they are superior in sound quality at that price range, although some may disagree with me on that one. I found my sweet spot with the Shure SE210s, and they have gone for long walks, bike rides, and shooting hockey pucks with minimal falling out.