The 62-1 on a T4 housing will get you where you want to be, and it won't break the bank. This is not from personal experience, but I have seen quite a few combos with that turbo in single and twin configuration over the years. Again, I cannot speak to the HY35, as I've never heard of it.
Generally, the old-school basic 61-70mm turbos will get you 600-ish hp through a manual. You'll want a free-breathing hot side, and higher is better on the A/R for the exhaust housing. Back-pressure is your enemy. Trust me though, toss the equals. They are only going to cause you heartburn.
Edit: Oh.. after looking at the spec on that HY35, I'm going to advise against it. The 2.25" outlet is way too small. The T28 inlet is the kind of inlet typically used on a twin setup for our motors. I don't like how it claims 3bar of boost without specifying the engine displacement. That's not a very technical way to write about a product. The .55 A/R housing is too small for a single turbo setup. That may be good for a twin setup, but you don't need twins for awesome spool or for the power you need. Given the choice, go with the 62.
