Where do you box? I have no idea when you say they are used for training. Pad work? Bag work, sparring?
I would suggest hook and loop and leather (invest in leather if this is a long term deal) If you are new and just want to get your feet wet, the everlast ones for $30-50 will do. You can find them at Wal mart, sport check etc..
And so you know, 160z is what is normally used for sparring. I would recommend 160z as well, to build your punching power.
I like the Select ones myself, but they retail for about $140. I only use mine for sparring only and my 12oz for padwork, and bag gloves for the bag sometimes.
Link for the Select golves: http://www.tepee-select.com/bgloves-S829-vinal.htm
Vinyl cracks. Be careful.
Here are the more affordable Everlast (youll find these everywhere) http://cgi.ebay.ca/BOXING-GLOVES-NEW...1%7C240%3A1318
And cruise craigslist, there are always lots of ppl that give up boxing when they get hit in the nose for the first time.