Option 1: Buy the CCnG Ducky Premier and choose a set of keycaps from here that you like: http://mechanicalkeyboards.com/shop/index.php?pg=1&l=product_list&c=40
Option 2: Buy a CoolerMaster QuickFire XT and choose a set of keycaps from here that you like: http://mechanicalkeyboards.com/shop/index.php?pg=1&l=product_list&c=40
The Ducky has better build quality and the caps it comes with are excellent. Both will be better than the Rosewill they're replacing.
The Ducky has Cherry stabilisers. IMHO they're better than Costar for a number of reasons (easier to change keycaps, no problems with thick keycaps, etc). If you feel like they're "mushy" when you bottom out, you can easily clip the little bendy bits off the bottom.
The CoolerMaster has Costar stabilisers like your Rosewill.
If I may ask, why fullsize? If you can live with smaller, I'd recommend a KUL ES-87 TKL. And why Browns? I would recommend to rather get Clears (larger tactile bump).
I prefer Costar stablizers 'cause I like the solid bottoming out feel that Costar stablizers offer. This is also why I prefer PBT keycaps aside from their durability. I wasn't aware that the Ducky comes with Cherry stablizers... Now that puts me off from the Ducky.
The reason I like going for the fullsize is that I tend to use the numpad a lot. A lot of my work involves balancing for games I develop in which heavily I constantly do maths and changing numbers of statsitics. Also, there are certain games that require the numpad. I own about 600 games on Steam, and I've only yet to encounter 3 of them which the keypad is required (2 of them does not provide remapping), but they were significant games that I enjoy quite a lot.
I had to go through two replacements with the Rosewill for connectivity issues and I'm never buying their products again (Their PC case I bought also broke).
The keyboard finally broke after 2 years, and now it's out of warranty.
As for preferring Brown, I've only had experience with Brown and Blue and I hated Blue so much. I also like Brown a lot. I like it not for the tactile bump, but for how soft they are to press.
Considering how often I make typing mistakes with the Brown, I just figured that I wouldn't like Red even though I know Reds are softer.
After the Rosewill, I just am looking for a full-sized keyboard with an amazing build quality. I've considered Das Keyboard 4, but I heard they switched their manufacturer from Costar to something else which now is in China so I decided against it.