Buy:
Kh 05 19" trials $467 - Very respectable unicycle, strong and light.
Things to replace eventually: Pedals, tyre, seat, seatpost, seat clamp
Nimbus 19" trials $180 - Great for learning trials, Will hold up to a fair bit of abuse but the crankset is only square taper
Things to replace eventually: Pedals, Crankset, Seatpost
Onza 19" trials $409 - Great unicycle, Extremely strong crankset
Things to replace eventually: Tyre, Pedals, Seatpost
Toker Unistar 19" trials $259 - Poorly design Unicycle, Good for starting off but as you advance in your trials (which is quickly) things will start to break
Things to replace eventually: Frame, Seatpost, Seat, Pedals, Tyre, Crankset
United trials 19" with profiles $555 - Great price for a great unicycle, Awesome hub and cranks, Good tyre
Things to replace eventually: Frame, Seatpost clamp, pedals, seat, seat post
Yuni trials with profiles $577 - Great price for a great unicycle, Awesome hub and cranks, Good tyre
Things to replace eventually: Frame, Seatpost, Pedals if you don’t like plastic
Build:
This will require time and a wheelbuild, Wheelbuild can be done yourself with instructions off the internet (http://www.sheldonbrown.com/wheelbuild.html) or a bikeshop should be able to do this for you
Option 1: Total: $525.40
Profiles (a little more expensive than the kh crankset but lifetime warranty!) $299
http://www.unicycle.com/shopping/shopexd.asp?id=145
Nimbus II frame (good inexpensive frame) $42
http://www.unicycle.com/shopping/shopexd.asp?id=851
Kh freeride 19" rim (debatably stronger than the alex dx32, easier to get tyre off) $35
http://www.unicycle.com/shopping/shopexd.asp?id=806
Marwi 14g spokes 40c x 36 $14.40
http://www.unicycle.com/shopping/shopexd.asp?id=539
Jim c’s (choice of pedals for many street riders) $33
http://www.unicycle.com/shopping/shopexd.asp?id=726
Kh fusion $54
http://www.unicycle.com/shopping/shopexd.asp?id=751
Kh post $18 (maybe worth upgrading to thomson later)
http://www.unicycle.com/shopping/shopexd.asp?id=666
Maxxis CC $30 (maybe worth upgrading to a luna tyre)
http://www.unicycle.com/shopping/shopexd.asp?id=750
Option 2: Total: $818.40
Profiles (a little more expensive than the kh crankset but lifetime warranty!) $299
http://www.unicycle.com/shopping/shopexd.asp?id=145
Maxxis CC $30 (maybe worth upgrading to a luna tyre)
http://www.unicycle.com/shopping/shopexd.asp?id=750
Kh freeride 19" rim (debatably stronger than the alex dx32, easier to get tyre off) $35
http://www.unicycle.com/shopping/shopexd.asp?id=806
Marwi 14g spokes 40c x 36 $14.40
http://www.unicycle.com/shopping/shopexd.asp?id=539
Kh 05 alu frame $199
http://www.unicycle.com/shopping/shopexd.asp?id=836
Jim c’s (choice of pedals for many street riders) $33
http://www.unicycle.com/shopping/shopexd.asp?id=726
Thomson post $75 (strongest post )
http://www.unicycle.com/shopping/shopexd.asp?id=511
Cf Seat base $79
http://www.unicycle.com/shopping/shopexd.asp?id=259
Kh fusion $54
http://www.unicycle.com/shopping/shopexd.asp?id=751
Option 3 Total: $425.4 + $18
Nimbus II frame (good inexpensive frame) $42
http://www.unicycle.com/shopping/shopexd.asp?id=851
Maxxis CC $30 (maybe worth upgrading to a luna tyre)
http://www.unicycle.com/shopping/shopexd.asp?id=750
Kh fusion $54
http://www.unicycle.com/shopping/shopexd.asp?id=751
Jim c’s (choice of pedals for many street riders) $33
http://www.unicycle.com/shopping/shopexd.asp?id=726
Marwi 14g spokes 40c x 36 $14.40
http://www.unicycle.com/shopping/shopexd.asp?id=539
Kh freeride 19" rim (debatably stronger than the alex dx32, easier to get tyre off) $35
http://www.unicycle.com/shopping/shopexd.asp?id=806
Kh post $18 (maybe worth upgrading to thomson later)
http://www.unicycle.com/shopping/shopexd.asp?id=666
Kh/onza Crankset $217 (99.5% as strong as profiles but without warranty)
http://www.unicycle.com/shopping/shopexd.asp?id=803
[I]Mixing and matching these components will make the unicycle more suited towards you and your budget.
Frame
Tyre
Spokes
Rim
Seatpost clamp
Seatpost
Seat
Pedals
Crankset[/I]