I normally use Mercabit, who are extremely reliable, but Alex is away until the 30th so I need a temporary vendor.
I've looked at bitexchange.biz and euromoneychange.com, but neither have any feedback to show they are reliable.
http://bitexchange.biz/ is an advertiser on my site, and I've not used them as I am in the US but I know they are spending a lot of money on advertising right now as they are one of the biggest and main advertisers for the operation fabulous ad group, they've spent over 3btc on just my site lately.
I don't think it would make sense for them to screw you out of ~3btc when they've spent many more times that on advertising, and if they were screwing people I think it would generate a lot of talk on the forums. For ~3btc right now I'd highly doubt you'd have any problems.
Taken the plunge and attempted to process my voucher through bitexchange.biz. I've not yet received any email confirmation, however the auto message said to allow 24 hours processing. I'll soon find out if they're a scam or not.
I was slightly concerned that they seem to trawl the "newbie" forum promoting their business...