I have really enjoy my manfrotto 190XDB with 486RC2 ball head. If you do some shopping around you can find them as a kit for under $150 (~£100£).
The tripod he linked above is also from what I am reading a good tripod. The maximum height should be the same, and the minimum height is actually smaller on the cheaper one, but the 'Folded Length' is the same(21"). The weight on the cheaper one is about 1lb greater (bringing it in to 4.5lbs) than that of the more expensive.
A brief feature comparison is below, I am not sure what you will be using it for, if you are not really hiking weight can be a good thing for stability.
I don't feel like making a table, so it will be in the following order
Feature: Voyager | Manfrotto
Max Height:--------58" | 57"
Min Height:---------11" | 14"
Fold Length:-------21" | 21"
Weight:-----------4.5lb.| 3.5 lb.
Load Capacity:----10lb.| 11lb.
Leg Sections:------3/4 | 3
Head:-----------3-way | Ball (Both quick release)
Spiked Feet:-------No | Optional
Like I said, it really depends on what you are doing, I personally would pick the manfrotto because I hike with it all the time, and the weight and ball head come in handy (obviously the head can be changed, but being sold as a kit, it is nice). Not to mention the spiked feet as an option. If you are planning on shooting from a level surface, and weight is not an issue, and the 10 lb' recommended for what it can support is ok, the cheaper one will float your boat. If you plan on shooting outdoors or go hiking, I can say you would be happy with the manfrotto, I got it for $100 with the ball head mentioned above, and it does everything I need it to and more. You can probably find one around for about $150 if you do some looking.
Ultimately it boils down to what you want to be able to do with it. Before you get anything though, wait for poizen or Mr. Switch to come in here, when it comes to the hardware aspect of photography from what I can tell, they know it all and they will probably be able to give you some other awesome options.
Oh, and the fold length on both of those is the same, and they should both fit in a suitcase.
Also, information on the Giottos GTMT 8246B is hard for me to find, but from the reviews I read, people seem to like it. Here is what I found out.
Leg Sections: 4
Weight: 2 lbs
Load: ~7-8 lbs
MAX Height: ~58"
MIN Height: ~8"
Fold Length: ~ 20"
Spiked feet: (Possibly retractable?, Unknown.)
From the reading I have done, Roughly in general, Manfrotto is the "Best Bang for your buck", and "Gitzo's" are the gold standard, if you will (usually costing around $400-$600). Concerning the Giottos you listed, I have not really heard much of the company, so I don't really know what to tell you beyond from what I have read, people that own them seem to be happy with them.
